Can anybody help I will mark brainlist

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse