59:12 A sequence is defined by the formula f(n+1)=f(n)-3. If f(4)=22, what is f(1)?
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Find solution of the linear equation y = 2/3x + 1/3

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?