Answer:
79
Step-by-step explanation:
To find the value of 
, when x = 3, simply plug in the value of x in the expression and solve as follows:
The value of , when x = 3, is 79
Answer:
C
Step-by-step explanation:
Answer:
M and N
Step-by-step explanation:
AD = AB
AD = 2r+8
AB = 5r-13
we need to find the value of r to find the total length
so 2r+8 = 5r-13
subtract 2r from each side:
8 = 3r -13
add 13 to each side:
21 = 3r
divide both sides by 3
r = 21 / 3 = 7
r=7
now we know r, so replace r with 7 in the equation for AD
AD = 2r+8 = 2(7) +8 = 14 +8 = 22
the answer is D. 22
