Answer:
11 years old
Step-by-step explanation:
Maggie's age is x
Maggie's brother = 4x - 7
The sum is 48
x + 4x - 7 = 48
5x - 7 = 48
5x = 55
x = 11
7 hours
10-3=7
0
The slope formula is (change in y)/(change in x)
since the numerator (change in y) is 0, the slope will be 0
