What determines if an equation is a one-to-one function?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

1. are the corresponding angles congruent 2. find the ratios of the corresponding sides 3. is triangle jkl congruent to triangle rst? if so what is the scale factor

Agroup of randomly selected members of the foodies food club were asked to pick their favorite type of food. the bar graph below shows the results of the survey. there are 244 members in the foodies.