PLEASE HELP URGENT!! The table shows the average daily high
temperature in a city each week for eight
weeks after the first day of spring. Which of
the following is an appropriate line of fit for
the data? Use the line of fit to find the
approximate temperature on the first day of
spring and the average rate of change in
temperature.

sss (side, side, side)

sas (side, angle, side)

asa (angle, side, angle)

aas (angle, angle, side)

hl (hypotenuse, leg)

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

the answer is:

mean: 6

mad: 2.14