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3 years ago

Explain how you would use properties do you write an expression equivalent to 7y+4b-3y.

Mathematics

1 answer:

erica [24]3 years ago

5 0

1st you combine like terms so subtract 7y and 3y and you get 4y. So this is the final answer: 4y+4b.

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3 years ago

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4 years ago

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adoni [48]

Answer:

Grade B score:

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Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 73.3

Standard Deviation, σ = 9.7

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$P( X > x) = P( z > \displaystyle\frac{x - 73.3}{9.7})=0.62$

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$=P( z \leq \displaystyle\frac{x - 73.3}{9.7})=0.38$

Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 73.3}{9.7} = 0.305\\\\x = 76.26$

We have to find the value of x such that the probability is 0.05

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Thus, the numerical value of score to achieve grade B is

$76 \leq x \leq 89$

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Answer:

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Read 2 more answers