Y=t+12 this is one the answers
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 
Download Photomath it helps and it gives you step by step or
Answer:
y/2 = tan(60) => y = 2 tan(60) = 2sqrt(3) = 3.464
Step-by-step explanation: