Answer: 
Step-by-step explanation:
See attached image.
Hello! here are the basic rules that you need to know to solve these problems:
a diameter is 2 × the radius
the circumference rule is 2×π×radius
I will solve the first question to show how to format.
1: 5/2=2.5
2×2.5×π=5×π=15.7
1000 ml = 1 L
76000 ml
76*1000 ml
76 L