(-22, 302.5) Question 2
7.15 pts
Sandra was comparing the electricity of two different companies. One company is charging $49 per month and $0.10 per kilowatt used.
The other company wanted $39 per month, but will charge $0.15 for all kilowatts after the first 100 kilowatts. Sandra used the following
system of equations to represent the situation.
Ca = 49 + 0.102
Cb = 39 +0.15(
2100)
Which answer is a reasonable solution, and what does it represent?

50x5=$250

step-by-step explanation:

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

a

step-by-step explanation: