1. Use integers from -9 to 9 to meet the following conditions. Do not use
numbers with the same absolute value more than once in each part.
a. Find all possible combinations of two integers whose sum is -1.
b. Find all possible combinations of two integers whose difference is 12.
c. Find all possible combinations of three integers whose product is 64.
d. Find all possible combinations of three integers whose product is -16.
e. Write and solve a word problem that can be solved using the quotient of
two integers.