Answer:
-70
Step-by-step explanation:
This is not an expression due to the =, because that makes it an equation. So I will assume the = is a +, to make it an expression.
1. Combine all negative numbers: -68 - 4 - 3 = -75
2. Add to 5, -75 + 5 = -70
If 3/5 of all the brownies is 21, then 5/3 of 21 is the number of the brownies that Lauren brought in.
That probably sounded super confusing. When multiplying a number by a reciprocal of a fraction (a fraction where the numerator and denominator is reversed), the previous fraction multiplication is reversed.
Multiplying 21 with 5/3 will give us the original number of brownies.

Lauren originally brought 35 brownies.
Answer:
7 dimes, 14 quarters, and 25 nickels
Step-by-step explanation:
do the math. :)
Answer:
C
Step-by-step explanation:
If you multiply the top equation by 7, you will get -7x.
Then, if you add -7x to 7x, it will eliminate the x value