What types of triangles can have an obtuse angle?

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

What is the value of x when x + 7 = 21?

With this question substitute t=3 and t=5 to determine if the two expressions are equivalent. 4(t + 3) 4t+12 which statements are true? check all that apply. a. the value of both expressions when t =5 is 32. b. the two expressions are not equivalent. c. the value of both expressions when t=3 is 15. d. the value of both expressions when t=5 is 23. e. the two expressions are equivalent. f. the value of both expressions when t=3 is 24.