Estimate a 15% tip a dinner bill of $47.64 by rounding a bill amount to the nearest ten dollars

$7.14

Step-by-step explanation:

$47.64 to $47.6

47.6*15/100

=$7.14

(I maybe wrong though lol)

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

p = 6s

step-by-step explanation: