The drawing shows the plan for a rectangular courtyard with a square garden at its center. The expression 2700-x? gives the area of the courtyard , in square feet, not including the garden. Which expression represents the area of the courtyard if the length of each side of the square garden is increased by n feet?

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

What situation is an example of an observational study

Abcd is a square. what is the measure of angle bac