Which expression is equivalent to (7^-8)(7^3)?

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

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.