Which table represents a linear function?

If square root x = -7, then x= -49 true or false

Find the domain and range of the following function f(x) = 51x - 21+ 4

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.