I think 128. <span>Surface Area = 2×(2×2 + 2×15 + 2×15) = </span><span>128 </span>
Answer: 
Step-by-step explanation:
For this exercise you need to find the Least Common Multiple (LCM).
The steps two find the Least Common Multiple are shown below:
1. Descompose the numbers into their prime factors.
2. Multiply the commons an non commons with the highest exponent. The product obtained will be the Least Common Multiple.
Knowing this, you can find the Least Common Multiple between 7 and 11. This is:

Therefore the smallest number of biscuits each must have baked is: 
You look, either on line or in an actual book, to
find how many miles are equal to 1 kilometer.
Then you use that number like this:
(7 kilometers) x (0.6214 mile/kilometer) = 4.25 miles (rounded)
-4x + 6y = 24
4x + y = -10
7y = 14
y = 2
2x - 6 = -12
2x = -6
x= -3