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3 years ago

15

How would you right this as an expression: your mother gave u $13.32 with which to buy a present. This covered 3|5 of the cost.

How much did the present cost?

1 answer:

Gnesinka [82]3 years ago

4 0

13.32=3/5x would be the expression.

22.20=x

The present cost $22.20

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The Z-score is calculated by the formula below

$\begin{gathered} z-score=\frac{(x-\mu)}{\sigma}_{} \\ \mu=\operatorname{mean} \\ \sigma=s\tan dard\text{ deviation} \\ x=\text{score} \end{gathered}$

Step 2: Substitute the given parameters in the formula

$\begin{gathered} z-\text{score}=\frac{145-165}{40} \\ Z=-\frac{20}{40} \\ Z=-\frac{1}{2} \\ Z=-0.5 \end{gathered}$

Hence, the z-score of a person who scored 145 on the exam is -0.5

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2 years ago

3x - 4y = 18<br>x + 3y = -7

Mnenie [13.5K]

Answer:

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Step-by-step explanation:

x+3y+-7

move variable to the right and -3y from each side

x+3y-3y=-7-3y

x= -7-3y

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3(-7-3y)-4y=18

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collect like terms

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move constant and change sign

-13y=18+21

add

-13y=39

divide by -13

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substitute

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Answer:

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