Answer:
a = -31
Step-by-step explanation:
According to the question,
-6a + 7a = -31
a = -31
M = mass
p = density
v = volume
Yes, to find m it would be m = pv.
To find v that would be m/p.
Answer: The correct answer is Choice D.
If 24 percent of the snack mix is pretzel, we simply need to multiply the total number of ounces by 0.24.
0.24 x 32 = 7.68
7.68 ounces of the snack mix will be pretzels.
Since we know that 1/4 is equal to 25%, or 0.25 in decimal form, we are able to work with 0.75 in the expression.
We are told to use j as the original price of the jeans, so we can set up the expression:
![j-0.25j](https://tex.z-dn.net/?f=%20j-0.25j%20)
to represent the cost of the jeans with the discount.
Then to simplify, we simply take out j as a common factor, and solve what's in the parentheses:
![j(1-0.25)](https://tex.z-dn.net/?f=%20j%281-0.25%29%20)
or ![0.75j](https://tex.z-dn.net/?f=%200.75j%20)
Using this equation, we can solve for the b part of the question. If the pair of jeans originally costs $60, plug in 60 to where j is in the expression:
![0.75j](https://tex.z-dn.net/?f=%200.75j%20)
![0.75(60)=45](https://tex.z-dn.net/?f=%200.75%2860%29%3D45%20)
Therefore, the cost of the jeans after the discount is C) $45.