5x+42=8x-15
42=3x-15
57=3x
x=19
A. 3&3/4
B. 4&5/9
C. 8&3/8
D. 12&3/11
E. 5&7/20
F. 2&145/174
Answer: 10%
Step-by-step explanation: The formula to calculate simple interest is Interest = Principal x Rate x Time
With the number in the formula, 112.50 = 1,250 x r x 1
Simplify:
112.50 = 1,250r
Divide both sides by 1,250:
.1 = r
Therefore, the rate is 10%
a 
7
because 4a + 7 - 7 35 - 7
equals 4a 28
and 4a/4 28/4
equals a 7
