Todd is using the benchmark 1/2 to compare fractions. which statement is not correct. a 5/6 less than a 1/2

That's the correct answer -- 5/6 is about 0.83, while 1/2 is 0.5, so you get a clear order. Another way to compare them is writing 1/2 as 3/6, again getting an order.

That is the correct anwser because 3/6=1/2 and 5/6 is greater 1/2<5/6

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 : )