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4 years ago

What is this .i need help

Mathematics

1 answer:

Lesechka [4]4 years ago

7 0

120138 subtract both and that would be the answer

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The ratio of boys to girls in band class was 3 to 5. If there were 24 boys. How many girls were in band class?

Tamiku [17]

Answer:

40 girls

Step-by-step explanation:

Set up a proportion where x is the number of girls in band class:

$\frac{3}{5}$ = $\frac{24}{x}$

Cross multiply and solve for x:

3x = 120

x = 40

So, there were 40 girls in band class.

7 0

3 years ago

Read 2 more answers

Explain the meaning of a poll that says 44% of Americans approve of the president's policies, with a margin of error of 2% and c

Ivenika [448]

Answer:

We are 90% sure that the true proportion of Americans who approve the ppresident's policies is in the interval from 42% to 46%.

Step-by-step explanation:

A confidence interval of a proportion p% at the x% level with m% margin of error means that:

We are x% sure that the true mean of the population is in the interval from (p-x)% to (p+x)%.

In this problem, we have that

90% confidence level

44% with a margin of error of 2%

So:

We are 90% sure that the true proportion of Americans who approve the ppresident's policies is in the interval from 42% to 46%.

3 0

3 years ago

It takes 60 minutes to make 2000 copies on an old copy machine. The newer copier works with the old copier to create 2000 sheets

Cerrena [4.2K]

The new copier can create 2000 copies in 20 minutes.

Step-by-step explanation:

Given,

It takes 60 minutes to make 2000 copies by old printer and 15 minutes to made x number of copies, therefore, using proportion

$60:2000::15:x$

Product of mean = Product of extreme

$2000*15=60*x\\30000=60x\\60x=30000$

Dividing both sides by 60

$\frac{60x}{60}=\frac{30000}{60}\\x=500$

As the new copier is working with old copier, therefore,

Copies made by new printer = 2000 - 500 = 1500

New copier can make 1500 copies in 15 minutes and 2000 copies in x minutes, using proportion

$1500:15::2000:x\\1500*x=15*2000\\1500x=30000$

Dividing both sides by 1500;

$\frac{1500x}{1500}=\frac{30000}{1500}\\x=20$

The new copier can create 2000 copies in 20 minutes.

Keywords: ratio, proportion

Learn more about proportions at:

#LearnwithBrainly

5 0

4 years ago

Which equation is a direct variation function?

Minchanka [31]

Answer:

y=x and y=1

4 x

Step-by-step explanation:

We know,

'Direct Variation function' is the function where two quantities vary directly i.e. variables x and y are said to be directly varying if 'y=kx' where k is the constant of variation.Thus, from the options, we see that the function,

y=x

is varying directly with the constant of variation i.e. k = 1.

y= 1

4 x

is also varying directly with constant k=1

3 0

3 years ago

Which statement could be represented by the expression 10g - 5?

Slav-nsk [51]

Answer
5(2g-1)

Explanation

5 0

3 years ago