He would have 21 before he bought the 10 stamp because 31-10=21
Answer:
Area is about 1520.53
Step-by-step explanation:

A = 
A ≈ 1520.53
Answer: 502.65
Step-by-step explanation: A= 2πrh + 2πr^ this is the formula for solving the surface area so now you must substitute
2·π·5·11+2·π·5^
6.28 · 55 + 2 π · 25
add and you will get 502.65 hope this helps mark me brainliest if it did
Answer:
0.49
Step-by-step explanation: