negative x subscript 15 minus x subscript 25 plus x subscript 35 plus x subscript 45 equals negative 280 negative x subscript 15 minus x subscript 25 minus x subscript 35 minus x subscript 45 equals 280 x subscript 15 plus x subscript 25 plus x subscript 35 plus x subscript 45 equals negative 280 all of the above. none of the above

Interpreting as: 280 x

Input:

280 x

Derivative:

d/dx(280 x) = 280

Indefinite integral:

integral280 x dx = 140 x^2 + constant

step-by-step explanation:

your mom

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