7a
TSA = 2lw<span> + 2</span>lh<span> + 2</span><span>wh
TSA = 140 + 70 + 100 = 310 ft^2
7b
310 x $4 =$1240
cost = </span>$1240
7c
V= wlh = <span>7×10×5 = </span><span>350 ft^3</span>
5%
Convert feet to inches by multiplying 5 by 12 (12 inches in 1 foot) 5×12=60
We know 5 feet is 60 inches so 5 feet 3 inches is 63 inches (60+3)
To find percent increase do 63÷60=1.05
1.05=5% increase
I'm not exactly sure what you're asking but <em />I'll give it a go.
A = x -6
6 more inches because if you add from 36 to 42 it gives you 6
