The force needed to break a board varies inversely with the length of the board. If it takes 38 pounds of force to break a 5 feet long board, how much force (in pounds) would it take to break a 4 feet long board. (Round your answer to the nearest tenth.)

The long jump record, in feet, at a particular school can be modeled by f(x) = 19.6 + 2.5ln(x + 1) where x is the number of years since records began to be kept at the school. what is the record for the long jump 11 years after record started being kept? round your answer to the nearest tenth.

For each proportion find the unknown number x 1/5/8=×/15

Which of the following circles have their centers on the x-axis? check all that apply.