What is (12.2a + 9.7b) – (18.1b – 0.2a) – (6.7a + 6.8b), simplified?
A: 5.3a – 15.2b
B: 5.7a – 15.2b
C:–12.6a + 2.7b
D: –12.6a + 3.1b

Can someone me and do the problem plz so i can understand it more better

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Abdul is making a map of his neighborhood he knows the following information: his home, the middle school, and high school are all on the same street. his home, the elementry school, and his friends house are on the same street. the angle between the elementary school, middle school, and his home is congruent to the angle between his friends house, the high school, and his home. what theorem can abdul use to determine the two triangles are similar? a- side side side similarity theoremb- angle angle similarity theoremc- corresponding parts of similar triangles are congruentd- pieces of right triangles similarity theorem