The table shows the time it took a group of students to complete a puzzle. work out an estimate of the time it took for the students to complete it and round it to two significant figures. What fraction of the students finish less than 20 minutes.

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question 1 answer: p/q can be terminating when q = 5^m * 2^n

question 2 answer: -1 and -1

question 3 answer: -4

question 4 answer: 5/12

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answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft

ƒ = 0.03b

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step-by-step explanation: