What is the solution set for 3x+1≥8 and 10x≤15
a. { x : 1 1/2 ≤ x ≤ 2 1/2 }
b. no solution
c. { x : 5 < x < 7 }
d. { x : x < 5 or x > 7 }

the answer is D

Step-by-step explanation:

picture below

  b.   the average rate of change of f(x) is less than the average rate of change of g(x).

step-by-step explanation:

since the length of the interval is the same in each case, we only need to compare the change in y-value to see which is greater.

so the change in y-value for function f is (6 )) = 9.

the table tells us

so the change in y-value for function g is (31 -1) = 30.

the change in y-value of f(x) on the interval is less than the change in y-value of g(x) on the same interval, so the average rate of change of f(x) is less than the average rate of change of g(x).