Are the two flags similar? If so which triangle similarity theorem did you use to make your conclusion? Need answer fast please

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

An appliance store sells lamps at $95.00 for two. a department store sells similar lamps at 5 for $250.00. which store sells at a better rate

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?