Answer:
112 in^2
Step-by-step explanation:
Given data
Length =2in
Width= 4in
Height=8 in
The expression for the total surface area is
SA=2lw+2lh+2hw
SA= 2*2*4+2*2*8+ 2* 4*8
SA= 16+ 32+ 64
SA= 112 in^2
Hence the surface area is 112 in^2
15% of 400 = x
.15 x 400 = x
X = 60 (tip)
400 + 60 = 460
Answer:

Step-by-step explanation:

Expand brackets.


Apply radical rule : 


-15(2x + 3) = -27
5(2x + 3) = 9
10x + 15 = 9
10x = -6
x= 0.6