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.

(x, y)→(x − 8, y − 7)

step-by-step explanation:

enjoy!

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

step-by-step explanation: 4 cause 2+2=4

answer: the answer is one

step-by-step explanation:

pemdas, in this situation there is no parenthesis or exponents so you go to multiplication, 1x1=1, then division 1/1= 1 then addition 1+1=2 then subtraction 2-1=1