Khan Academy creator Sal Khan makes 10 videos a day. How many videos does he make in 14 days?

140

Step-by-step explanation:

10x14 = 140

140

Step-by-step explanation:

multiply the number of days by the number of videos he makes in one day. 14*10=140

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

1. supplementary angles

2. acd and bcd

step-by-step explanation: