Find the area of of the rectangle: length 5 ft and width 13 ft

i do not understand what it is asking me!

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

What is the solution set of the quadratic inequality x^2-5< or equal to 0