A formula for determining the finite sum, S, of an arithmetic sequence of numbers is S = [(a+b), where n is the number of terms, a is the first term, and b is the last term.
Express b in terms of a, S, and n.

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)

what am i trying to find out. you didn't put up the whole question.

step-by-step explanation: