Let f(x) = 5 –x
f-1(x) =

I got for my answer f-x

Step-by-step explanation:

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Part (a): number of minutes of butterfly strokes is xnumber of minutes of breaststrokes is ywe are given that: he practices breaststrokes 20 minutes more than butterfly stroke. this means that: y = 20 + xwe are also given that: he practices a total of 50 minutes. this means that: x + y = 50based on the above, the pair of linear equations representing the situation would be as follows: x + y = 50 > equation iy = 20 + x > equation iipart (b): we need to get the values of x and y.to do so, substitute with equation ii in equation i and solve for x as follows: x + y = 50x + 20 + x = 502x = 50 - 202x = 30x = 15substitute with x in equation ii to get y as follows: y = 20 + xy = 20 + 15y = 35based on the above: number of minutes of butterfly strokes = x = 15 minutesnumber of minutes of breaststrokes = y = 35 minutespart (c): we are given that number of butterfly stroke = x = 45 minuteswe know that number of breaststrokes is 20 more than butterfly strokes.butterfly strokes = 20 + 45 = 65 minutestherefore, ted would need a total of 45 + 65 = 110 minutes of practicesince we know that he practices 50 minutes only, therefore, this is not possible.hope this : )