book Maths Puzzle Numerical Ability

y>1/3x-2

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Old Isaac dropped from his perch on Mrs. Cohen's window ledge 25 feet above ground. Teh equation h=16t*2+25 gives Isaac's height above the ground in feet as a function of time, t, connie has $10 to buy doughtnuts and coffee. she needs to buy coffee,whitch is $3.50, and will spend the rest on doughnuts. if the doughnuts are $0.40 each, what is the maximum number of doughnuts she can buy?