Triangle RST and XYZ are shown below. Emma knows that R X and T Z. She claims that triangles RST and CYZ are congruent. As part of her reasoning, which criterion could she use?

Explain why the function is discontinuous at the given number a. (select all that apply.) f(x) = 1 x + 1 a = −1 f(−1) is undefined. lim x→−1+ f(x) and lim x→−1− f(x) exist, but are not equal. lim x→−1 f(x) does not exist. f(−1) and lim x→−1 f(x) exist, but are not equal. none of the above

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Can someone me out here number 4 plz