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21.7²=17²+13.5²
21.7²=289+182.25
21.7²=471.25
21.7=√471.25
21.7=21.7
22(to the nearest whole number)
x f(X) g(x)2.5 2 1.25
1.5 0 -2.75
2.75 2.5 2.56
2.8 2.6 2.84
2.77 2.54 2.67
2.73 2.46 2.45 <<<<<<< Answer.
I've included a graph to show you another way that you could get closer quicker.
The red line is y = 2x - 3
The blue line is y = x^2 - 5
Last year total estimated cost: $2,265
This year (after 1 year) total estimates cost for 2 years is: 1.05 X $2,265 = $2,378.25
So, for 1 year will be the half of the above amount: $2,378.25 : 2 = $1,189.13