If y = x^3 + x please help! :)

Can u guys please answer these questions

aliya0001 [1]

Answer:

Im not sure about Q1 but I'll help with Q2

9 =

$\sqrt{81}$

8 =

$\sqrt[3]{512}$

14 =

$\sqrt{196}$

2 =

$\sqrt[3]{8}$

4 =

$\sqrt{16}$

I hope this helps :)

If you would like me to, i will respect your wishes and delete my answer.

8 0

2 years ago

36 out of 100 randomly selected taxpayers knew about tax incentives for installing energy-saving furnaces. Find a 90% confidence

tresset_1 [31]

Answer:

The 90% confidence interval for the population proportion who knew about the incentives is (0.28, 0.44).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 100, \pi = \frac{36}{60} = 0.6$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.36 - 1.645\sqrt{\frac{0.36*0.64}{100}} = 0.28$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.36 + 1.645\sqrt{\frac{0.36*0.64}{100}} = 0.44$

The 90% confidence interval for the population proportion who knew about the incentives is (0.28, 0.44).

7 0

3 years ago

How much should you invest at 5% simple interest in order to earn $100 interest in 12 months?

marissa [1.9K]

Answer:

You should invest $2000 at 5% simple interest in order to earn $100 interest in 12 months.

Step-by-step explanation:

Using the formula

$I = Prt$

where

I = Interest earned

P = The principal (let say in $)

r = The Interest Rate

t = time

Given that

I = $100

r = 5%

t = 12 month = 1 year

P = The principal amount needed to invest (let say in $)

Thus,

$I = Prt$

100 = P × 5% × 1

100 = P × 5/100 × 1

100 × 100 = P × 5

10000 = P × 5

P = 10000/5

= 2000 (let say in $)

Thus, you should invest $2000 at 5% simple interest in order to earn $100 interest in 12 months.

7 0

2 years ago

a baker has 10 cups of sugar to make cookies each batch calls for 1 1/3 cups sugar how many batches can he make

Nata [24]

4/3 x 7=9.3333
4/3 x 8=10.666
Can't go over 10, so you can only make 7 batches.
Hope I've helped!

6 0

3 years ago

Solve the system of equations. - 52 + 2y = 9 y = 70

ludmilkaskok [199]

Agreed, I had to take a test on it and y did equal 70

7 0

3 years ago

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