What is the solution to this equation?

Whal

x-12 = 9

C

O A. x = 21

O B. x=-21

O C. x=-3

O D. x = 3

A train leaves the station heading north on the tracks. It takes the train 6 seconds to reach 60 miles per hour. It completes the entire 60 mile trip in one hour. Calculate the train's average speed and velocity over the one hour trip.

How would i solve this - 8x + 5 > 11?

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What is x/2 - 4x = 3x - 13

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