Help please I don’t understand both of these questions

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

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom