Answer:
A) 100 x (4/5)
Step-by-step explanation:
Spent a total of 100 dollars, all being the same price
Each is 20 dollars.
For 4 pairs it would be 80.
100 x (4/5) = 80
Answer:

Step-by-step explanation:
The mean is the sum of the allowances divided by the number of students.

Answer:
y=3x+2
Step-by-step explanation:
Answer: The man has 10$.
Step-by-step explanation:
We start with the number 60. He sells the goat for 70 dollars, and makes a 10 dollar profit. Then, he buys it for 80$, leaving him with 0. But then he sells it for 90$, making another profit of 10$.
Answer:
Each graph has one y-intercept, which is a solution.
Step-by-step explanation:
I used the process of elimination, so none of the others were true, or explained why there were two solutions.
I hope this helps you!