7. How many uses both Networks? *
a. 100
b. 22
c. 122
d. 64
8. Solve - |-4 - 3| = *
a. 1
b. 7
c. -7
d. -1
9. What is the sum of (–9) + (+22) = *
a. 13
b. -13
c. 31
d. -31