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4 years ago

I keep getting these wrong can anybody help

Mathematics

2 answers:

natulia [17]4 years ago

8 0

9. $(y^{-3})^{6}$
   $(\frac{1}{y^{3}})^{6}$
   $\frac{1}{y^{18}}$

10. $(-h^{4})^{5}$
   $-h^{20}$

Ganezh [65]4 years ago

4 0

The answer is y/18.

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A sample has a mean of M = 90 and a standard devia-tion of s 20.=a. Find the z-score for each of the following X values.X = 95X

sladkih [1.3K]

Answer:

$\begin{gathered} X=95,z=0.25 \\ X=80,z=-0.5 \\ X=98,z=0.4 \\ X=88,z=-0.1 \\ X=105,z=0.75 \\ X=76,z=-0.7 \end{gathered}$

Explanation:

Given a sample with the following:

• Mean,M = 90

• Standard deviation, s = 20

To find the z-score for each of the given X values, we use the formula below:

$\begin{equation*} z-score=\frac{X-\mu}{\sigma}\text{ where }\begin{cases}{X=Raw\;Score} \\ {\mu=mean} \\ {\sigma=Standard\;Deviation}\end{cases} \end{equation*}$

The z-scores are calculated below:

$\begin{gathered} \text{When X=95, }z=\frac{95-90}{20}=\frac{5}{20}=0.25 \\ \text{When X=80, }z=\frac{80-90}{20}=\frac{-10}{20}=-0.5 \\ \text{When X=98, }z=\frac{98-90}{20}=\frac{8}{20}=0.4 \end{gathered}$ $\begin{gathered} \text{When X=88,}z=\frac{88-90}{20}=\frac{-2}{20}=-0.1 \\ \text{When X=105, }z=\frac{105-90}{20}=\frac{15}{20}=0.75 \\ \text{When X=76, }z=\frac{76-90}{20}=\frac{-14}{20}=-0.7 \end{gathered}$

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1 year ago

Problem 33

trasher [3.6K]

Answer:

$94.81

Step-by-step explanation:

the selling price (before discount 20%) =

$98.60 ÷ (100-20)%

= $98.60 ÷ 0.8 = $123.25

the store paid for the clarinet =

$123.25 ÷ (100+30)%

= $123.25 ÷ 1.3 = $ 94.81

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3 years ago

Ms. Gonzales is investing $17000 at an annual interest rate of 6%

Lena [83]

Answer:

44398.84

Step-by-step explanation:

17,000e^(0.06)(16)

it helps to use a desmos scientific calculator

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3 years ago

Which ordered pairs are on the line with equation y−0.75=1.25(x−3)y?

sergejj [24]

Hello :
Answer : A because : -8-0.75 =1.25(-4-3)
-8.75 = -8.75

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4 years ago

Write an equation for :<br><br> Three times a number decreased by five is equal to twenty five.

max2010maxim [7]

Answer:

3x-5=25

Step-by-step explanation:

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