To find the value of the expression 5b+c³ when b = 7 and c = 4, we substitute the values of b and c into the expression:
5b + c³
= 5(7) + 4³
= 35 + 64
= 99
Therefore, the value of the expression 5b+c³ when b = 7 and c = 4 is 99. So, the correct answer is D) 99.