please help ! I need help with math because I am failing and I might have to repeat the grade.. I have a quiz right now I don’t understand this question I will provide a photo above thank you <3!

Answer:it’s D
Step-by-step explanation: Solve the rational equation by combining expressions and isolating the variable B. So B=45
Answer: D.45
Step-by-step explanation: 3.2 ÷ 4 is .8 when rounded up. 36 ÷ 45 is also .8 when rounded up. Hope this helped.