They are similar and the answer is SSS
If you are saying that the hypotenuse is 10 cm the you have to solve the following equation using the Pythagorean theory.
4^2 + b^2 = 10^2
16 + b^2 = 100
16 - 16 + b^2 = 100 - 16
b^2 = 84
Find
4000+7000= 11,000 nearest thousands
4281+7028= 11,309 actual number
13000-5600=7400...that's about it, just multiply then subtract
The answer you are looking for is B. 15