Question

Please help! Given an arithmetic sequence with a7=19 and a12=54, find a15.

Answer 1

75

Answer 2

Wait! How'd you figure that out?

Answer 3

U have to form two equations here

Answer 4

and solve it

Answer 5

The nth term is a+(n-1)d

Answer 6

because you have two numbers that are five apart, that means you added the same number to a7 five times to get to a12

Answer 7

a is the first term

Answer 8

a12-a7=35
35/5=7
so each term is 7 apart

Answer 9

then add 7 to a12 three times
54+7+7+7=75