Question

find the cost of 78th item if c=5x^2+9x-3​

Answer 1

Answer:

Cost of 78th items,

C = Rs. 31119

x = 78,

C(x) = 5x²+9x-3

C(78) = 5(78)² + 9(78) -3

= 30420 + 702 - 3

= 31119Rs