There's only one answer your answer.
Answer:
3 9/10
Step-by-step explanation:
39 = 3(10) + 9
10(x^2) = 80x
(divide by the 10)
x^2 = 8x
which also equals
(x)(x) = 8x
(divide by x)
x = 8
R - 13 <= 15
Add 13 to both sides:
r <= 28
Note '<=' is less than or equal to.
