exam Maths Puzzle Numerical Ability

Mary wants her $9000 GIC to double in value in nine years. What annual rate of interest is required for her to reach her goal. Assume interest is compounded annually. (Can someone

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A Daycare center chrages a $75 enrollemnt fee plus $100 per week. The function f(x)=100+75 gives the cost of daycare for x weeks. Graph this function and give its domain and range The square of a number added to the original number is 72.
Determine all possible values of the number.