Question

Buddy the elf has made 4 trains and can make 2 trains per hour. Which equation represents how many trains he can make in x hours?

a) 2x - 4
b) 4x
c) 4 + 2x
d) 2x + 4

Answer 1

The equation that represents how many trains Buddy the elf can make in x hours is 2x + 4. Buddy can make 2 trains per hour and has already made 4 trains.

Step-by-step explanation:

The equation that represents how many trains Buddy the elf can make in x hours is d) 2x + 4.

To understand why this is the correct equation, we need to break it down step by step:

1. Buddy can make 2 trains per hour, so in 1 hour he can make 2 trains.
2. In 2 hours, Buddy can make 2 trains per hour, so he can make 2x2 = 4 trains.
3. Adding the 4 trains Buddy has already made, the equation becomes 4 + 2x.
4. Finally, to account for the additional 4 trains Buddy can make, we add 4 to the equation, giving us 2x + 4.