Which of these triangle pairs can be mapped to each other using both a translation and a rotation about C

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

How can you tell when x and y are not directly proportional?

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.