Please help this is urgent I will mark brainliest and 20 points!

Answer:
B= 9.78 or 9.8
Step-by-step explanation:
S is for Squared
Cs= As+Bs
Bs= Cs-As
Bs=14s-10s
Bs=196-100
Bs=96
B is the square root of Bs
square root 96
B=9.78