Please help! Don’t answer if you don’t know it I’m in the middle of a test!

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account