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2 years ago

Please help me with this mathematics worksheet

Mathematics

1 answer:

Tatiana [17]2 years ago

5 0

Answer:

1. 3570

2.-8y+32

3. 8y-(2y^2)(1+y)

4.x-y

5. 4^2−3−^2

Step-by-step explanation:

The distributive property means that you can multiply each number in a set of parentheses by the number outside the parentheses or by the numbers in another set of parentheses instead of doing the multiplication as a whole

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Use the given domain to find the range of function: f(x)=−2x²+7, D={2, −3, 0}

soldi70 [24.7K]

Answer:

R={-1, -11, 7}

Step-by-step explanation:

-2(2)^2+7=

-2(4)+7=

-8+7=

-1

-2(-3)^2+7=

-2(9)+7=

-18+7=

-11

-2(0)^2+7=

-2(0)+7=

0+7=

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3 years ago

Kylie starts with $145 in her piggy bank. Each month she adds $20.

djverab [1.8K]

Kylie's first month collection, a1= $ 145

Second month collection , a2= $145+ 20

Third month collection, a3 = $145 +2*20

so for n months collection = an-1+20

We get an= 20 + an-1 and a1=145

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3 years ago

Taryn collected data for the rain collected over a number of days in various cities. Which of the data sets represents a scatter

garri49 [273]

Answer:

Step-by-step explanation:

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3 years ago

What is x-2y=-1 and 2y+y=4 using elimination step by step

Alja [10]

Answer: is it supposed to be 2y+y=4?

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3 years ago

Read 2 more answers

A study of peach trees found that the average number of peaches per tree was 725. The standard deviation of the population is 70

TEA [102]

Answer:

She needs to sample 189 trees.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation of the population is 70 peaches per tree.

This means that $\sigma = 70$

How many trees does she need to sample to obtain an average accurate to within 10 peaches per tree?

She needs to sample n trees.

n is found when M = 10. So

$M = z\frac{\sigma}{\sqrt{n}}$

$10 = 1.96\frac{70}{\sqrt{n}}$

$10\sqrt{n} = 1.96*70$

Dividing both sides by 10:

$\sqrt{n} = 1.96*7$

$(\sqrt{n})^2 = (1.96*7)^2$

$n = 188.2$

Rounding up:

She needs to sample 189 trees.

3 0

3 years ago