For every pound a company spends on advertising, it spends £0.45 on its website. Express the amount spent on advertising to the amount spent on its
website as a ratio in its simplest form.

The graph below could be the graph of which exponential function?

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?