F(x)=2(x-5)^2 + 3. For which values of x will f(x) be invertible

Which shows how to solve the equation 3/4x=6 for x in one step?

Areflection of shape i across the y-axis, followed by a , and then a translation left 6 units and down 4 units confirms congruence between shape i and shape ii. alternatively, a of shape ii about the origin, followed by a reflection across the y-axis, and then a translation right 4 units and up 6 units confirms congruence between shape ii and shape i.

What ratio is proportional to 18/21