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3 years ago

Given f(x) = -2x + 7, evaluate for f(10)

Mathematics

2 answers:

Alekssandra [29.7K]3 years ago

6 0

Answer:

-13

Step-by-step explanation:

Plug in 10 as x into the function:

f(x) = -2x + 7

f(10) = -2(10) + 7

f(10) = -20 + 7

f(10) = -13

So, f(10) = -13

STatiana [176]3 years ago

3 0

i honestly don't know... sorry!??

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A large on-demand, video streaming company is designing a large-scale survey to determine the mean amount of time corporate exec

Firdavs [7]

Answer:

554 executives should be surveyed.

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 Z-table as such z has a p-value 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.

Standard deviation of 3 hours.

This means that $\sigma = 3$

The 95% level of confidence is to be used. How many executives should be surveyed?

n executives should be surveyed, and n is found with $M = 0.25$ . So

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

$0.25 = 1.96\frac{3}{\sqrt{n}}$

$0.25\sqrt{n} = 1.96*3$

$\sqrt{n} = \frac{1.96*3}{0.25}$

$(\sqrt{n})^2 = (\frac{1.96*3}{0.25})^2$

$n = 553.2$

Rounding up:

554 executives should be surveyed.

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3 years ago

True or false: Climate of an area is established without studying long term weather patterns PLS HELP THIS IS SCIENCE NOT MATH

Amanda [17]

True I’m pretty sure: Climate can change without studying weather patterns, you don’t need to study them for climate to be established. If i’m wrong sorry

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3 years ago

Free points: this is because of all the kindness I have seen on brainly:

const2013 [10]

Answer:

10x10= 100

Step-by-step explanation:

thx for the points

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Reflect the figure over the line <br> x<br> =<br> 2<br> x=2.

inessss [21]

2 = 2????

Thats what Im getting it from.

Since x is 2 then it would still be 2=2 in simple term.

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2 years ago