exam Maths Puzzle Numerical Ability

Is this an example of an exponential function?

y = 4800(0.75)^x

Why or why not?

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exam Other Question

A lottery pays the winner $1 on the first day, $2 on the next day, and so on, doubling the payment on each successive day.

a. What is the payment on the fifteenth day?
b. Find
You have at least $30 in change in your drawer, consisting of
dimes and quarters. Write an inequality that shows the different number of coins
in your drawer.