Answer:
21+3x
Step-by-step explanation:
multiply the 3 by everything inside the parentheses
kids at zoo, k = 325
percentage boys, b = 64%
percentage girls, g = 100 - b = 36%
number of girls = 325 × 36% = 117
the second one
-1 -2
3 0
5 1
7 2
the answer is letter D