Create a system of inequalities that describes the constraints in this situation

Let r = 3. what is the value of r + 58?

What percent of 18 is 24? and plz explain thx.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.