PLEASE HURRY AND ANSWER I WILL MARK BRAINLIEST Which expressions are equivalent after simplifying? Check all that apply.

A) (3.1a – 2.7b) + (1.5a – 4.9b)
B) (2.3a + 0.2b) – 8b
C) (–3.5b + a) – (4.1b – 3.6a)
D) –0.4b + (8b + 4.6a)
E) 4.6a – 7.6b

It costs 4.25 for 1 pound of roast beef. how much will it cost to purchase 2.5 pounds of roast beef? round to nearest cent

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Which best explains why this triangle is or is not a right triangle ?