The 8th term of an ap is 17 and 19 term is 39 find the common difference

2

Step-by-step explanation:

an = a1 + d(n-1) is the formula

17 = a1 +d(8-1 ) = a1 *7d

39 = a1 +d (19-1) =a1+ 18d

We have 2 equations and 2 unknown.  Subtract to eliminate a1

39 = a1 +18d

-17 = a1 +7d

22 = 11d

Divide by 2

22/11 = 11d/11

2 =d

The common difference is 2

d

step-by-step explanation:

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.