2√15 x -2√10 simplify the radical

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project