What is 3(5+w) in its equivalent form and in distributive property

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Explain how you can use the associative property to evaluate (7x50)x4.

Tom drove 206 miles in 3.9 hours. estimate his average speed.