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3 years ago

Twenty percent of what number is 40?

Mathematics

2 answers:

Lostsunrise [7]3 years ago

6 0

Answer:

20% is 8 of 40

Step-by-step explanation:

The answer is actually very simple because all you have to do is multiply 20% by 40.

Therefore

A=8

I hope this helped.

marissa [1.9K]3 years ago

3 0

Answer:

N = 200

Step-by-step explanation:

Of means multiply and is means equals

20% * N = 40

Change to decimal form

.20 N = 40

divide by .2

.20/.20 * N = 40/.20

N = 200

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Use this data in the problem below. Follow the steps carefully. Round to the nearest tenth. Lot 1: Week 1: 600 Week 2: 300 Week

Dafna11 [192]

Answer:

Step-by-step explanation:

The given data set is:

Week 1: 600

Week 2: 300

Week 3: 500

Week 4: 900

The following are the steps to find the standard deviation:

Step 1. Jim enters the data and calculates the average or mean.

$Mean=\frac{600+300+500+900}{4}=\frac{2300}{4}=575$

Step 2. Jim calculates the deviation from the mean by subtracting the mean from each value.

Data value (x) $x-{\overline{x}}$

600 25

300 -275

500 -75

900 325

Step 3. Jim squares each deviation to remove negative signs.

Data value (x) $(x-{\overline{x}})^2$

600 625

300 75625

500 5625

900 105625

Step 4. Jim sums the squares of each deviation and divides by the count for the variance.

$Variance=\frac{625+75625+5625+105625}{4}=46875$

Step 5.Jim takes the square root of the variance to find the standard deviation.

$Standard deviation=\sqrt{46875}=216.50$

4 0

3 years ago

Read 2 more answers

Pls help I need it now

Marina CMI [18]

Answer:

I think the answer is C sorry if I'm wrong but hope I helped

5 0

3 years ago

F(x)= 7.45x +33.7 at x=-4.3

weeeeeb [17]

To solve this function, all we need to do is substitute -4.3 in for wherever "x" appears and then simplify.

f(x) = 7.45x + 33.7; x = -4.3

f(-4.3) = 7.45(-4.3) + 33.7

f(-4.3) = -32.035 + 33.7

f(-4.3) = 1.665

This means that, when x = -4.3, f(x) = 1.665.

Note: It may help to remember that, in a function such as this, f(x) can be thought of as the "y" value that corresponds to the given "x" value (in fact, when writing it out with words, f(x) is the same as "function of x"). And, if you are given a value for f(x), then the opposite is true. Just substitute in the value given for f(x) and solve for x.

Hope this helps!

8 0

4 years ago

What type of triangle is this

olga_2 [115]

Answer:

an acute triangle

Explanation:

All of the angles are less than 90 degrees, which is an acute triangle.

3 0

2 years ago

Read 2 more answers

A store has been selling 300 Blu-ray disc players a week at $600 each. A market survey indicates that for each $40 rebate offere

timurjin [86]

Answer:

75 $

Step-by-step explanation:

According to problem statement p(300) = 600

And we know that with a rebate of 40 $, numbers of units sold will increase by 80 then if x is number of units sold, the increase in units is

( x - 300 ) , and the price decrease

(1/80)*40 = 0,5

Then the demand function is:

D(x) = 600 - 0,5* ( x - 300 ) (1)

And revenue function is:

R(x) = x * (D(x) ⇒ R(x) = x* [ 600 - 0,5* ( x - 300 )]

R(x) = 600*x - 0,5*x * ( x - 300 )

R(x) = 600*x - 0,5*x² - 150*x

R(x) = 450*x - (1/2)*x²

Now taking derivatives on both sides of the equation we get

R´(x) = 450 - x

R´(x) = 0 ⇒ 450 - x = 0

x = 450 units

We can observe that for 0 < x < 450 R(x) > 0 then R(x) has a maximum for x = 450

Plugging this value in demand equation, we get the rebate for maximize revenue

D(450) = 600 - 0,5* ( x - 300 )

D(450) = 600 - 225 + 150

D(450) =

D(450) = 600 - 0,5*( 150)

D(450) = 600 - 75

D(450) = 525

And the rebate must be

600 - 525 = 75 $

5 0

3 years ago