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3 years ago

URGENT PLEASE HELP Definitely need the correct answers as I am failing precalculus

Mathematics

1 answer:

dangina [55]3 years ago

6 0

Answer (first one):

${x|-2\leq x\leq 8}$

Step-by-step explanation:

think of f(x) as y.

$y>-2$

Now find the parts on the x axis that correspond with parts on the y value that are greater than -2.

$x\geq -2 \\x \leq 8$

This would be all of the numbers between -2 and 8 (inclusive).

The reason it is inclusive is because the arrow ends are shaded in.

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Write the percent as a fraction in simplest form and as a decimal 36%

Darya [45]

Answer:

0.36, 9/25

Step-by-step explanation:

36% converts to the decimal fraction 0.36.

36% can also be expressed in the reduced fractional form 36/100= 9/25.

8 0

3 years ago

Read 2 more answers

P(-2) = 1P(-1) =3 P(1) = 0 P(2) = 4

ratelena [41]

p(-1) p(-2) p(1) p(6)= 4

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2 years ago

A university researcher wants to estimate the mean number of novels that seniors read during their time in college. An exit surv

lys-0071 [83]

Answer:

Population mean = 7 ± 2.306 × $\frac{2.29}{\sqrt{9} }$

Step-by-step explanation:

Given - A university researcher wants to estimate the mean number

of novels that seniors read during their time in college. An exit

survey was conducted with a random sample of 9 seniors. The

sample mean was 7 novels with standard deviation 2.29 novels.

To find - Assuming that all conditions for conducting inference have

been met, which of the following is a 94.645% confidence

interval for the population mean number of novels read by

all seniors?

Proof -

Given that,

Mean ,x⁻ = 7

Standard deviation, s = 2.29

Size, n = 9

Now,

Degrees of freedom = df

= n - 1

= 9 - 1

= 8

⇒Degrees of freedom = 8

Now,

At 94.645% confidence level

α = 1 - 94.645%

=1 - 0.94645

=0.05355 ≈ 0.05

⇒α = 0.5

Now,

$\frac{\alpha}{2} = \frac{0.05}{2}$

= 0.025

Then,

$t_{\frac{\alpha}{2}, df }$ = 2.306

∴ we get

Population mean = x⁻ ± $t_{\frac{\alpha}{2}, df }$ × $\frac{s}{\sqrt{n} }$

= 7 ± 2.306 × $\frac{2.29}{\sqrt{9} }$

⇒Population mean = 7 ± 2.306 × $\frac{2.29}{\sqrt{9} }$

3 0

3 years ago

Read 2 more answers

If the diameter of a sphere is doubled, its surface becomes

hodyreva [135]

Volumes scale as the cube of a corresponding dimension. Therefore, if the radius of a sphere is doubled (r becomes 2r), the surface area becomes 2 squared, or 4 times the original surface area. The volume would become 2 cubed, or 8 times the original volume.

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3 years ago

Which of the following are exterior angles? Check all that apply.

Naily [24]

Answer:

Exterior angles are <4 and <6

Step-by-step explanation:

From the figure we can see a triangle and its some exterior angles.

Exterior angles means that angles on the out side.

<u>To find the exterior angles </u>

From the figure we get exterior angles are,

<4 and <6

All the other angles <1, <3 and <5 are inside the triangle.

Therefore the correct answer is,

exterior angles are <4 and <6

4 0

3 years ago