Juan hires an electrician Juan pays a one time fee of 30$
Juan pay 45$ for each hour the electrician works

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.

b. x + 1

step-by-step explanation:

i'am smart

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