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
By representing the power because exponents work with powers.
Pretty sure it’s the second one
Answer:
-2n-1
Step-by-step explanation:
n +4n-7n-1
-2n-1
