Work out 5^-2 x cube root of 8

Answer in decimal form please.

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

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