math problem

Question

In a certain archery competition, archers shoot 25 arrows and receive penalty points for each missed shot: 1 penalty point for the first miss and for each subsequent miss a penalty that is ½ point greater than for the previous miss. If an archer received 7 penalty points total, how many times did he hit the target?

In a certain archery competition, archers shoot 25 arrows and receive penalty points for each missed shot: 1 penalty point for the first miss and for each subsequent miss a penalty that is ½ point greater than for the previous miss. If an archer received 7 penalty points total, how many times did he hit the target?

Answer 1

Write out the sequence:

1, 1.5, 2, 2.5, 3, 3.5

What is the common difference?

What is the formula for the sum of an AP?