Answer:
x = -25
Step-by-step explanation:
25 = -7(x + 5) + 5x
25 = -7x - 25 + 5x
5x - 7x - 25 = 25
5x - 7x - 25 + 25 = 25 + 25
5x - 7x = 50
-2x = 50
-2x/-2 = 50/-2
x = -25
A)
Let X be the food expenditure of a family.
Let the population mean of an expenditure of a family be.
Let the population standard deviation of an expenditure of a family be.
The proportion families spend more than $30 but less than $490 per month on food is,
3x8 is 24 plus 4 is 28
7x1 is 7 plus 2 is 9
9+28 is 37
By making a the subject of formula in the given equation, the value "a" is equal to 1/(56Q + 32GQ).
<h3>What is an equation?</h3>
An equation can be defined as a mathematical expression which shows that two (2) or more thing are equal.
In this exercise, you're required to solve for a from the given mathematical expression (equation) by making it the subject of formula. This ultimately implies that, all the other variables would be defined in terms of a and they would all be on the same side of the "equal to" symbol.
Making a the subject of formula, we have:
-4G + 1/8Qa = 7
1/8Qa = 7 + 4G
Multiplying both sides by 8Q, we have:
8Q × 1/8Qa = (7 + 4G) × 8Q
1/a = 56Q + 32GQ
a = 1/(56Q + 32GQ).
Read more on subject of formula here: brainly.com/question/21140562
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