Answer:
A = 708 mm^2
Step-by-step explanation:

Answer: S+2,
a+b,
c-(a+b),
z+12,
t- (s+5) ,
(15+d) -c
Step-by-step explanation:

First we distribute the negative throughout the last polynomial:

Combine like terms:
Answer:
x=-2
Step-by-step explanation:
3( x-4)= -18
Divide each side by 3
3( x-4)/3= -18/3
x-4= -6
Add 4 to each side
x-4+4 = -6+4
x = -2
Answer:
Research indicates that happiness is related to one's age.
Step-by-step explanation: