The longest runway at an airport has the shape of a rectangle with an area of 2181600sqft. this runway is 180 ft wide. how long is the runway

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

7+(3n++8) what is the answer to this?

Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.