2. Holly collects video games. She starts with 3x³ games, for some numberx, and then buys another 7x⁴. She then gives away x², then sells 5x, and finally donates another 9 games. Write an expression for the number of games Holly now has in standard form A -9 + 7x4 - 5x + 3x3 - x2
B 3x3 – 5x + 7x4-9-X2
C 7x4 + 3x3 - x - 5x - 9
D -9-5x - x2 + 3x3 + 7x4​

a

step-by-step explanation:

i think it will be zero as slope has a formula of difference between initial and final distance divided by itz time interval

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