I GIVE BRAINLIEST AND 20 POINTS. please someone solve me these. Explain how and it would be better wth a pic. thank u.

Answer:
A = 12
B = 0
r = 2
Step-by-step explanation:
A) √121 + 3/5 + 2/5 = 11 + 1 = 12
B) √100 - 3 -7 = 10 - 3 - 7 = 0
r) 1/2 - 1/2 + √4 = 2