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frosja888 [35]
2 years ago
6

When f(x) = 7x^2 - 2x + 4, evaluate f(-1) f(-1) =

Mathematics
1 answer:
Blizzard [7]2 years ago
5 0

Answer:

13

Step-by-step explanation:

do u want me to elaborate on how I found it>

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Sketch a graph to math this: The Olympic skier waited at the top of the mountain for 2 minutes before heading down the ski slope
vladimir2022 [97]

Answer:

7 minutes

Step-by-step explanation:

5 0
3 years ago
How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the populati
marshall27 [118]

Using the z-distribution, it is found that a sample of 171 should be selected.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

\overline{x} \pm z\frac{\sigma}{\sqrt{n}}

The margin of error is:

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

In which:

  • \overline{x} is the sample mean.
  • z is the critical value.
  • n is the sample size.
  • \sigma is the standard deviation for the population.

For this problem, the parameters are:

z = 1.96, \sigma = 40, M = 6

Hence we solve for n to find the needed sample size.

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

6 = 1.96\frac{40}{\sqrt{n}}

6\sqrt{n} = 40 \times 1.96

\sqrt{n} = \frac{40 \times 1.96}{6}

(\sqrt{n})^2 = \left(\frac{40 \times 1.96}{6}\right)^2

n = 170.7.

Rounding up, a sample of 171 should be selected.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0
1 year ago
At a party, 75% of the people are adults and 25% are children. What is the simplest ratio of adults to children?
mr_godi [17]

0.3:0.1

Step-by-step explanation:

first convert the % to decimals.

75%=0.75

25%=0.25

then look for a common factor and divide be that, in this case its 5.

0.75/5=0.15

0.25/5=0.5

now since these arent in the simplified form, you gotta divide again by 5.

0.15/5=0.3

0.5/5=0.1

3 0
1 year ago
Juan divided 1/2 jar of fish food into 7 equal parts. He feeds his fish one part each day.
amid [387]
1/14 is the correct answer
5 0
2 years ago
Read 2 more answers
Molly is excited to have fresh basil at home. She buys a basil plant that is 90 millimeters tall and puts it on her kitchen wind
satela [25.4K]

Answer:

Molly's basil plant is now 17 centimeters

Step-by-step explanation:

90 millimeters=9 centimeters

20cm-12cm=8cm

9cm+8cm=17cm  

hope this helped :)

5 0
1 year ago
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