Find the sum. Express the answer in scientific notation (1.54 x 10°)+(6.15 x 10°)
O 7.69 x 10
09.471 x 10
7.69 x 1012
9.471x1012
20 points

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

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.