Answer:
x = -5
Step-by-step explanation:

D=dog's weight
c=cat's weight
d=7c
d+c=72
sub 7c for d
7c+c=72
8c=72
divide both sides by 8
c=9
d=7c
d=7(9)
d=63
dog=63lb
Answer:
18
Explanation:
Square root of 4 is 2. So replace it
(3x2) 3
6 x 3 = 18
Answer:
False
Step-by-step explanation: