Answer:
35
Step-by-step explanation:
both are prime. so multiply each other to find the common denominator. 5x7 is 35. 10/35 plus 21/35 is 31/35 which cannot be reduced any further so yes
answer
C = 263.76 m
C = 2×pi×r
C = 2×3.14×21
C = 131.88 m
For 2 rounds,
C = 131.88 x 2
6 cm^3