Is 8 · 9 -5= 72-5 an expression?

The deepest part of the swimming pool is 12 feet deep.the shallowest part of the pool is 3 feet deep.what is the ratio of the deeply of the deepest part of the pool to depth of the shallowest part of a pool?

In which section of the graph does the actual solution to the system lie y> x/3 y

An airplane can ascend at a rate of 52 1/2 meters in 1/3 of a second. how many meters can the airplane ascend in one second?