The answer choices are: 1,2,3,4,5. Please answer these question(s)! It has to do with math statistics. I will give you brainliest and thanks! Please answer my other questions!

What are “like terms”? why can we only add like terms?

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)