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4 years ago

Subtract

Mathematics

1 answer:

alexgriva [62]4 years ago

8 0

Answer:

A. 4x² - 2x + 11

Step-by-step explanation:

(4x² + 6) - (2x - 5) =

Drop the first set of parentheses since it is unnecessary.

= 4x² + 6 - (2x - 5)

To drop the second set of parentheses, you must change every sign inside the parentheses.

= 4x² + 6 - 2x + 5

Now combine like terms.

= 4x² - 2x + 11

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4 years ago

On a statistics examination the mean was 78 and the standard deviation was 10. (a) Determine the standard scores of two students

Ludmilka [50]

Answer:

a) Grade = 93, Standard score = 1.5

Grade = 62, Standard score = -1.6

b) Standard scores = 0.6, Grade = 84

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Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 78

Standard Deviation, σ = 10

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) Grade = 93

$\text{Standard score } = \displaystyle\frac{93-78}{10} = 1.5$

Grade = 62

$\text{Standard score } = \displaystyle\frac{62-78}{10} = -1.6$

b) We have to find grades of student

Standard scores = 0.6

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Grade = 84

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3 years ago

Jose bought a new car 2 years ago for $18,000. The value of his car decreased exponentially by 17% and is now

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Thus, the answer is D

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3 years ago