book Maths Puzzle Numerical Ability

How would you determine this problem? V= 4/3 * (pie) * r(cubed) with r as the independant variable. How would you find the x and y points to graph this equation?

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book Other Question

1/5(x+4)-8=3/5x-2

1/5 is 1 over 5, it's a fraction just in case you didnt know. thanks a lot!! John, twelve years old, is three times as old as his brother. How old will John be when he is twice as old as his brother?