Write a sine or cosine function for the data set

Jan: 39
Feb: 42
Mar: 50
Apr: 72
Jun: 80
Jul: 86
Aug: 77
Oct: 66
Nov: 55
Dec: 44

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.

Jennifer is 20 miles north of her house, and she is driving north on the highway at a rate of 55 miles per hour whats the slpoe