I think you forgot to mention Susan's current age if not:
x+5
x-4
6x
When writing the equation keep in mind that 7 + x is said as a term that is squared so it has to be squared while it's still together; (7 + x)².
Answer:
3 * 5
Step-by-step explanation:
As there are no repeated primes, no exponents are necessary.
It will take five hours and twenty five minutes