Your friend has improved in his math class. On his first test he scored 50 points, and then he scored 53, 56, 59, and 62 points on his next 4 tests. His tests continued to improve following this pattern. If he took 15 tests, how many points did he score on the last test?

Answer 1

So you have an arithmetic sequence with
a = 50 and d = 3
You want term(15)
= a + 14d = 50 + 14(3) = 92