331 students went on a field trip 6 busses were filled and seven students traveled in cars. How many students were in each bus? select 2 equation to model this scenario

331-7=6b
331=6+7b
331-7b=6
331-b=7
331=6b+7
331=13b

Can any one me with the answers to these questions asap?

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january.what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed.use 3.14 for π .