the product of 15 and a number by its self four times.
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9 x 9 = 81
The expression for "forty times m" can be written as 40m. In this expression, the number 40 is being multiplied by the variable m. This means that you are taking 40 and multiplying it by whatever value m represents. This expression simplifies to the product of 40 and m.
There are really infinitely many ways to write 4x4 in exponents, but consider what 4x4 really means and what an exponent is. First, an exponent states how many times a number is multiplied by itself, such as 3^2, or 3 "squared", meaning that the result is 3x3. With this in mind, look back at 4x4. Since the number multiplied is the same, we can write it using exponents. In this case, we are going to have 4^2, or four "squared". This is of course only one example, but I'm sure that that will likely be sufficient for your purposes.
(4n) - 25
When you see "9 times a number," it means you are multiplying that number by 9. For example, if the number is 5, then 9 times 5 would equal 45. In mathematical terms, you would write this as 9 * x, where x represents the unknown number.