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Strike441 [17]
3 years ago
5

Find the value of the expression: −0.5(7b−12a)−(8.4a−14b) if a=−10; b=−6.

Mathematics
1 answer:
ELEN [110]3 years ago
3 0

Replace a and b in the equation with their values given:

-0.5(7(-6)-12(-10)-(8.4(-10)-14(-6))

Multiply within the parentheses

-0.5(-42 + 120) -(-84 + 84)

Add inside the parenthesis:

-0.5(78)-0

Multiply:

-.05 x 78 = -39

The answer is -39

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GaryK [48]

The value of the given expression is 11.57

<h3>Division of number</h3>

Division are written as a ratio of two values. Given the expression below

5+6+6+2^6 ÷ 7

Simplify to have:

(11+6+64)÷ 7

Simplify the expression in parenthesis

81÷ 7

11.57

Hence the value of the given expression is 11.57

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7 0
2 years ago
Can someone please answer ASAP !!
Leya [2.2K]
Not for 5 points sorry
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3 years ago
the average starting salary for this year's graduates at a large university (lu) is $55,000 with a standard deviation of $6,000.
alexira [117]

0.84% of the graduates will receive the tax break

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean  and standard deviation , the z-score of a measure X is given by:

Z = x - μ / σ

Z-scores are used to measure how far a measure is from the mean. We find the p-value associated with this Z-score by looking at the z-score table after finding the Z-score. The p-value represents the probability that the measure is smaller than X, which is the percentile of X. The probability of the measure being greater than X is calculated by subtracting 1 from the pvalue.

μ = $55,000 σ = $6,000

This is the pvalue of Z when X = $39,600. So

z = 39600 - 55000 / 6000

z = -2.5

z = -2.5 has a o value of 0.0084

0.84% of the graduates will receive the tax break.

To learn more about similar tax break:

brainly.com/question/15563518

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7 0
1 year ago
Bob gets paid 64 hour heard that is 2/3 Melissa makes how much is Alicia paid per hour
Thepotemich [5.8K]

Answer:

64

Step-by-step explanation:

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2 years ago
Solve the equation 169x^2+36=0
KonstantinChe [14]
The answers are 6i/13 and -6i/13. The work it attached below

5 0
3 years ago
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