How can you find 40% of 150 using mental math? Explain.

Answers

Answer 1

Answer:

60

Step-by-step explanation:

rid of precentage and zeros, multiply the numbers you have left.


Related Questions

Solve the following:

1. even integers between 1 and 101
2. first 25 terms of the arithmetic sequence 4, 9, 14, 19, 24 ...​

Answers

Answer:

1.  2550

2.  1600

Step-by-step explanation:

Question 1

Even Integer: A whole number that can be positive, negative, or zero, and that can be divided exactly by 2.

Even integers between 1 and 101:  

2, 4, 6, 8, 10, ... , 100

This forms an arithmetic sequence with:

first term (a) = 2common difference (r) = 2

Sum of the first n terms of an arithmetic series:

[tex]\boxed{S_n=\dfrac12n[2a+(n-1)d]}[/tex]

There are 50 even integers between 1 and 101.  

Therefore, to find the sum of the even integers between 1 and 101, substitute n = 50 and the found values of a and r into the formula:

[tex]\begin{aligned}\implies S_{50} & =\dfrac{1}{2}(50)[2(2)+(50-1)2]\\\\& =25[4+(49)2]\\\\& =25[4+98]\\\\& =25[102]\\\\& = 2550\end{aligned}[/tex]

Therefore, the sum of the even integers between 1 and 100 is 2550.

Question 2

Given arithmetic sequence:

4, 9, 14, 19, 24, ...

From inspection of the given arithmetic sequence:

first term (a) = 4common difference (r) = 9 - 4 = 5

Sum of the first n terms of an arithmetic series:

[tex]\boxed{S_n=\dfrac12n[2a+(n-1)d]}[/tex]

To find the sum of the first 25 terms of the given arithmetic sequence, substitute n = 25 and the found values of a and r into the formula:

[tex]\begin{aligned}\implies S_{25} & =\dfrac{1}{2}(25)[2(4)+(25-1)5]\\\\& =\dfrac{25}{2}[8+(24)5]\\\\& =\dfrac{25}{2}[8+120]\\\\& =\dfrac{25}{2}[128]\\\\& = \dfrac{3200}{2}\\\\& = 1600\end{aligned}[/tex]

Therefore, the sum of the first 25 terms of the given arithmetic sequence is 1600.

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Each day a small business owner sells 200 pizza slices at $2.50 per slice and 85 sandwiches at $2.00 each. Business
expenses come to $60 per day. What is the owner's profit for a ten-day period?
The profit is S

Answers

The owner's profit for a ten-day period is equal to $ 6100.

We are given that:

Selling price of 1 pizza slice =  $ 2.50

Number of pizza slice sold per day = 200

Selling price for pizza slices in a day = 200 × $ 2.50

SP ( pizza ) = $ 500

Selling price of 1 sandwich = $ 2

Number of sandwich sold per day = 85

Selling price for pizza slices in a day = 85 × $ 2

SP ( sandwich ) = $ 170

Selling price in 1 day = $ 500 + $ 170 = $ 670

Now, Cost price in 1 day = $ 60

Profit in  1 day = $ 670 - $ 60 = $ 610

Profit in 10 days = 10 × $ 610 = $ 6100

Therefore, the owner's profit for a ten-day period is equal to $ 6100.

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Does anyone get this thanks

Answers

Answer:

350p2+19500p-199000

(The first term is actually -350p² but I guess you have to write it as -350p2)

Step-by-step explanation:

Looks like that first term in the revenue equation is -350p²

We have
E = -1500p + 199000
R = -350p² + 18000p

Profit = Revenue - Expenses = R - P

Profit = -350p² + 18000p - (-1500p + 199000)

= 350p² + 18000p + 1500p - 199000

= 350p² + 19500p - 199000

5 positive integers are arranged in
ascending order, as follows:
5, 6, 7, 7, x
The mode and the range are equal.
Find x.
x

Answers

Answer: x=12

Step-by-step explanation:

The range is: x-5

The mode is: 7

Hence,

x-5=7

x-5+5=7+5

x=12

If Z is the Circumcenter of TUV, find each missing measure

Answers

Answer is

VY = 17

UZ =21

WV = 14.7

TV = 29.4

TU = 38

SOLVING STEPS

WV = [tex]x^{2}[/tex]+[tex]15^{2}[/tex] =  [tex]21^{2}[/tex]

       ⇒[tex]x^{2}[/tex]  + 225 = 441

      ⇒ [tex]x^{2}[/tex] =  441-225

      ⇒ [tex]x^{2}[/tex] = 216

      ⇒ x = [tex]\sqrt{216}[/tex]

VY = 17

UZ =21

WV = 14.7

TV = 29.4

TU = 38

The circumcentre of a triangle is defined as the point where the perpendicular bisectors of the sides of that particular triangle intersect. In other words, the point of concurrency of the bisector of the sides of a triangle is called the circumcentre.

Method to Calculate the Circumcentre of a Triangle

Steps to find the circumcentre of a triangle are:

Calculate the midpoint of given coordinates, i.e. midpoints of AB, AC, and BC

how to calculate the slope of the particular line :

By using the midpoint and the slope, find out the equation of the line (y-y1) = m (x-x1)

Find out the equation of the other line in a similar manner

Solve two bisector equations by finding out the intersection point

Calculated intersection point will be the circumcentre of the given triangle

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SOH CAH TOA

I don't understand this stuff I have a test coming up can someone pls help me with this i am stuck​

Answers

I'll help with the question at the bottom of the page. The rest are unfortunately too blurry.

The x is the adjacent side to the reference angle. The 7 is the hypotenuse. The hypotenuse is always opposite the 90 degree angle.

Let's use the trig ratio cosine.

cos(angle) = adjacent/hypotenuse

cos(39) = x/7

7*cos(39) = x

x = 7*cos(39)

x = 5.44002 which is approximate

x = 5.4

Make sure your calculator is in degree mode.

\frac{\left(7x+4\right)}{2}=2-\left(2x+8\right)

Answers

Answer:5

Step-by-step explanation: I used this website called step-by-step calculator and then typed in your question

-2 2/3 divided by 4/3

Answers

Answer:

-2

Step-by-step explanation:

[tex]Rule(s): a\frac{b}{c} = \frac{a \cdot c + b}{c}, \frac{-a}{b}=-\frac{a}{b}, \frac{\frac{a}{b}}{\frac{c}{d}}=\frac{a\cdot \:d}{b\cdot \:c} \\2\frac{2}{3}=\frac{2\cdot 3+2}{3}\\=\frac{8}{3}\\=\frac{-\frac{8}{3}}{\frac{4}{3}}\\=-\frac{\frac{8}{3}}{\frac{4}{3}}\\=\frac{-8\cdot \:3}{3\cdot \:4}\\= \frac{-24}{12}\\= -2[/tex]

Find all the zeros of the quadratic function.


y=x^2+ 8x + 12

If there is more than one zero, separate them with commas.

If there are no zeros, click on "None".

Answers

Answer:

x=-2, -6

Step-by-step explanation:

factor the expression

y=x^2+ 8x + 12

y= (x+2)(x+6)

set the equation equal to 0, since you are finding zeros, or solutions

0=(x+2)(x+6)

split the equation into two parts

0=(x+2) and 0=(x+6)

solve the equations

you should get 2 zeros

x=-2, -6

Describe a set math po to guys pang grade 7 what is a set??

Answers

Answer:

A set is well-defined so that we can always tell what is and what is not a member of the set

Can someone help me with this question please like I really need this asap.

Answers

Using the fact that the two angles are complementary, the we will find that the measures are:

∠1 = = 14°

∠2  = 76°

How to find the measures of the angles?

By looking at the diagram, we can see that the sum of the measures of angles 1 and 2 must be equal to 90° (this means that the two angles are complementary).

We also can see that:

∠1 = x - 5

∠2 = 4x

Then we can solve the linear relation:

(x - 5) + 4x = 90

x - 5 + 4x = 90

5x - 5 = 90

5x = 90 + 5 = 95

x = 95/5 = 19

Then the measures of the two angles are:

∠1 = (x - 5)° = (19 - 5)° = 14°

∠2 = 4x = 4*19° = 76°

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How do I solve



-1 2/3 - -5/6

Answers

Answer:

-7/6

Step-by-step explanation:

negative 5 over 6−

5

6

≈negative 0.833−0.833

Question 7
Which function below does not have a domain of (-∞0, ∞0)?
○ f(x) = {²+2
²+2,
[4x-1, ifr <1
if x ≥1
O f(x)= 2² +1
Of(x) = √2r-1+4
Of(r) = 3r² - 5x + 2
4.5

Answers

Answer:

Step-by-step explanation:

What functions have a domain of (- ∞ ∞?

Which function below does not have a domain of (-∞0, ∞0)?○ f(x) = {²+2²+2,[4x-1, ifr <1if x ≥1O f(x)= 2² +1Of(x) = √2r-1+4Of(r) = 3r² - 5x + 24.5

The domain of any polynomial function (including quadratic functions) is x∈(−∞,∞). Functions of even degree will have a bounded range (from below if the leading coefficient is positive, from above if it's negative), and functions of odd degree will have range y∈(−∞,∞).

A technical analyst would consider a put call ratio of ____ as a bearish indicator.
a. 40 percent
b. 30 percent
c. 50 percent
d. 60 percent

Answers

A technical analyst would consider a put call ratio of  30 percent as a bearish indicator.

What in SAPM is technical analysis?

Technical analysis is a type of security analysis that makes use of price and volume data, which are often graphical represented in charts. To provide investing advice, the charts are examined using a variety of indicators.

Which technical metric is regarded as bullish?

One technical indicator that gauges the discrepancy between current prices and historical prices is the Channel Commodity Index (CCI). Its reading ranges from 100 to -100. Prices are viewed as bullish when CCI shifts from the negative to close to 100.

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Help with my math !!

Answers

The third one should be your answer

Answer: 3rd down :D

Step-by-step explanation:

This is because the problem is asking for Q to be in the middle of B and N and the only answer that applys to this is 3 :D.

6x +3 = 2x - 9

help please

Answers

Answer:

the equation is false

Step-by-step explanation:

6x + 3 = 2x - 9

6x - 2 x = -9 - 3

4x = -12

x = -12 : 4

x = -3

----------------

CHECK

6 * (-3) = 2* (-3) - 9

-18 = -15

the equation is false

X=—12/5 or x=—2.4 I’m really sure

square root method 5x+9=134

Answers

Answer:

Step-by-step explanation:

What are you trying to find? If you want to find x then:

5x = 134 - 9

5x = 125

x = 25

if you want square root then,

x = √625    or

x = 5^2

The following table shows the number of hours some teachers in two schools expect students to spend on homework each week.

School A

9

14

15

17

17

7

15

6

6

School B

12

8

13

11

19

15

16

5

8

Part A: Create a five-number summary and calculate the interquartile range for the two sets of data. (5 points)
Part B: Are there any outliers present for either data set? Justify your answer mathematically. (5 points) (10 points)

Answers

Answer:

Part A: School A Interquartile range = 9.5. School B Interquartile range = 7.5

Part B: There are no outliers present for either data set.

Step-by-step explanation:

For Part A, school A interquantile range is 9.5. Five number summary of school A is minimum = 6, quarantine q1= 6.5, median = 14, quarantine q3 = 16, and maximum = 17. Calculate Q3-Q1 = 16 - 6.5 which gives you 9.5

For School B, the interquartile range is 7.5. Five number of summary of school B is minimum = 5, quarantine q1 = 8, median = 12, quarantine q3= 15.5, maximum = 19. IQR Range = Q3-Q1 = 15.5 - 8. Which gives you 7.5

For Part B: All the outcomes of school A in between the values of -7.75 and 30.25. So this means there is no outliers in school A. For school B, all the outcomes of school B in between the values of -3.25 and 26.75. So there are no outlines in school B.

The sears tower in chicago is 443 m tall. Joe wants to set the world’s stair climbing record and runs all the way to the roof of the tower. If joe’s average upward speed is 0. 60 m/s, how long will it take joe to climb from street level to the roof of the sears tower?.

Answers

It will take Joe 738.3 seconds (12.3 minutes) to climb from street level to the roof of the sears tower.

What is speed?The definition of speed is the rate at which an object's position changes in any direction. Speed is defined as the ratio of distance traveled to time spent traveling. Because it has only one direction and no magnitude, speed is a scalar quantity. Speed is a measure of how quickly something moves or is done, or how fast something moves. A car traveling at 45 miles per hour is an example of speed. Someone cleaning a room in 10 minutes is an example of speed. A jaguar's speed is an example of speed.

To find how long will it take joe to climb from street level to the roof of the sears tower:

If Joe moves at 0.6 m/s in the vertical direction, the total distance he must cover is 443 meters in the vertical direction. The formula for average speed is now:Average speed = total distance / total timeTotal time = total distance / average speedTotal time = 443/0.6Total time = 738.3 seconds

Therefore, it will take Joe 738.3 seconds (12.3 minutes) to climb from street level to the roof of the sears tower.

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Analyze the table of values for the continuous function, f(x), to complete the statements.

A local maximum occurs over the interval
.

A local minimum occurs over the interval
.

Answers

A local maximum occurs over the interval  (-2,0)  

A local minimum occurs over the interval  (0,2)

How do you find a function's maximum value?

We may calculate the maximum of a continuous and twice differentiable function f(x) by first differentiating it with respect to x and then equating it to 0.

A local maximum occurs over the interval (-2,0)  

A local minimum occurs over the interval  (0,2)

Step-by-step explanation:

-lukelaws hope i helped if i di please give me brainliest if i was wrong i am very sorry!

Mark is purchasing new tiles for his bathrooms. The home improvement store charges $48 for each box of tiles when three or fewer boxes are purchased, $45 for each box when 4 to 8 boxes are purchased, $42 for each box when 9 to 19 boxes are purchased, and $38 for each box when more than nineteen boxes are purchased.
a. Write a piecewise function describing the cost of the boxes of tile.

Answers

Answer:

f(x)=

1. 48x when x < or = 3,

2. 45x when 4 < or = x < or = 8

3. 42x when 9 < or = x < or = 19

4. 38x when x > 19

Step-by-step explanation:

3 boxes or less = Cost of tiles = $48

4 - 8 boxes ; cost = $45

9 - 19 boxes ; cost = $42

> 19 boxes ; cost = $38

sentence below is True or False.
Any multiplication can be undone by multiplying by the same number.

Answers

Answer: False

Step-by-step explanation:

Write a quadratic function in standard form Vertex (1,9); passes through (4,6)

Answers

 y =  -3 ( x - 1 )² + 9 is  quadratic function in standard form Vertex .

How does a parabola's vertex shape work?

The coordinates of the point where a parabola crosses its axis of symmetry can be determined using the vertex formula for parabolas. The point is the vertex (h,k). As is common knowledge, a parabola's standard equation is y = ax2+bx+c.

given ,   Vertex =  (1,9)

              point =  (4,6)

The formula is  

              y = a + ( x - h )²  + k

where  h = 1  , k = 9

then    y = a ( x - 1 )² + 9

Find the value of

a when one of the points is  ( 4,6)

  6 = a ( 4 - 1 )²  +  9

  6 - 9 = 9a  

    -3  = 9a

     a =  -9/3  ⇒ -3

put value of a

 y = a ( x - 1 )² + 9

 y =  -3 ( x - 1 )² + 9

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hey can anyone help me out withthis question pls? we need to find the total surface area​

Answers

Answer:

60000 cm squared 600 dm squared or 60 cm squared

Step-by-step explanation:

add 7.5m, 2.25 and 50cm and give results in metres​

Answers

The sum of the three values is 10.25 meters.

Here, we are given three measurements- 7.5m, 2.25m and 50cm

Since, we need to find the answer in meters, let us convert all the units to meters so that we can add them.

7.5 and 2.25 are already in meters so we do not need to covert them.

We only need to convert 50 centimeters.

As per mathematical conversions,

1 meter = 100 centimeters

This means that 50 centimeters will be,

100/2 centimeters = 1/2 meters

⇒ 50 centimeters = 0.5 meters

Now, we add all the given numbers,

= 7.5 + 2.25 + 0.5

= 9.75 + 0.5

= 10.25

Thus, the sum is 10.25 meters.

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An object is moving at a speed of 63 centimeters every 2 days. Express this speed in meters per hour.Round your answer to the nearest hundredth.

Answers

This speed in meters per hour is 0.01 meter per hour

How to determine the speed?

The given parameter is

Speed = 63 centimeters every 2 days

Divide 63 by 2

So, we have:

Speed = 31.5 centimeters every day

There are 24 hours in a day

So, we have

Speed = 31.5 centimeters every 24 hours

100 cm equals 1 m

So, we have:

Speed = 0.315 meters every 24 hours

Divide

Speed = 0.013125 meter per hour

Approximate

Speed = 0.01 meter per hour

Hence,  this speed in meters per hour is 0.01 meter per hour

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The length of a rectangle is four times its width.
If the perimeter of the rectangle is 70 yd whats the length and width

Answers

Answer:

length is 20 width is 5

Step-by-step explanation:

35

5 20

4 x 14= 56 for length. 56+14=70. 14= width. Hope this helps.

If you answer you get 15 points.

Answers

Answer:D

Step-by-step explanation:

Answer:

I think it's the last one, the one that have month 4,6,8.

Step-by-step explanation:

A standard train ticket in a certain city costs 3 per ride. people who use the train also have the option of purchasing a frequent-rider pass for 18.75 each month. with the pass, a ticket costs only 2.25 per ride. how many train rides in a month make the frequent-rider pass a better deal than standard train tickets?



a. 26 or more rides

b. 24 or more rides

c. 25 or more rides

d. 27 or more rides

Answers

Number of  train rides to make the frequent-rider pass a better deal than standard train tickets is 26 or more rides.

As given,

Cost of standard train ticket = 3 per ride

Price of frequent rider pass= 18.75 each month

Cost of ticket using rider pass = 2.25 per ride

let x be the number of rides

Equation:

18.75 + 2.25x < 3x

⇒ 0.75x > 18.75

⇒ x > 25

Therefore, number of  train rides to frequent-rider pass a better deal than standard train tickets is 26 or more rides.

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i need asers pls now

Answers

342 = 2, 3, 6, 9

191 = no factors

1235 = 5

40320 = 2, 4, 8

16 = 2, 4, 8

78448 = 2, 4, 8

588 = 2, 4 , 12

67 = no factors

925 = 5

60043 = no factors

3663 = 3, 6

350 = 5

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