3.2h+4=23.2 please help me ​

Amaple syrup producer records th amount of sap collected from each of his trees. the line plot shows the results for one day. what is the least amount of sap any one tree produced?

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

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.