Why there must be two equation if there are two variables to solve the equation?​

i dont know sorry

step-by-step explanation:

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right

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113.1

step-by-step explanation:

v=4

3πr3=4

3·π·33≈113.09734