How do i write an equation in standard form?

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

Twelve less than a number is at most 20