Explain why cos(x)=sin(90-x) for x such that 0

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

One integer is 5 more than another. their product is 104. find the integers