8r and 4r are like terms since they both have an r
also 3s and -3s are also like terms because of the s
The answer is A. because first, you need to multiply 90 times 3 which will equal 270 seconds. Then, once you divide the seconds by 60 to figure how many minutes 270 seconds is, you get 4.5 minutes.
Measure the sides and angles. they are similar because they’re the same type of triangles, they’re only congruent if there sides and angle are the same.