How many 4-digit numbers can you write if you can use only digits 0, 1 and 2?

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.

Prove that 16^4-2^13-4^5 is divisible by 11.

Find │–14│ a. 14 b. –14 c. start fraction 1 over 14 end fraction