Answer:
-6 and 6
Step-by-step explanation:
Because one is a positive and one is negative, they cancel each other out equaling 0.
Step-by-step explanation:

in 2nd exp. this is because by using the formula of a2-b2
Answer:
73,028.8520
pretty sure that’s what you’re asking?
Answer:
Jean is 9 and Tom is 15.
Step-by-step explanation:
3 years ago, Tom was 12 and Jean was 6, hence Tom was twice as old as Jean.
Since that was their age 3 years ago, they are currently 15 (Tom) and 9 (Jean).
Add 2 years to each of these ages, you get 17 and 11.
17 + 11 = 28