In △ABC, m∠A = 65° and m∠B = 80°. Select the triangle that is similar to △ABC.

A. △DEF, in which m∠E = 80° and m∠F = 35°
B. △GHI, in which m∠H = 80° and m∠I = 45°
C. △MRT, in which m∠t = 35° and m∠T = 60°
B. △JKP, in which m∠J = 65° and m∠P = 45°

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.