If i have 800 dollars and i want the new iphone 7 which is around 1000
how much more dollars would i need

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g