g(x) = 0.4x - 1.8
Since the output, or g(x), is 4.6, substitute that number in for g(x).
4.6 = 0.4x - 1.8
Add 1.8 to both sides of the equation.
4.6 + 1.8 = 0.4x - 1.8 + 1.8
6.4 = 0.4x
Now, divide 6.4 by 0.4.
The answer is x = 16. The output is also x.
Answer:
10 minutes
Step-by-step explanation:
Let's use the variable x for the amount of coins.
The first machine can sort x coins in 15 minutes, so its speed is x/15 coins/minute.
The second machine can sort x coins in 30 minutes, so its speed is x/30 coins/minute.
If we sum the speeds, we have that the speed will be:
speed = (x/15) + (x/30) = (2x + x)/30 = 3x/30 = x/10
The total speed can sort x/10 coins per minute, that is x coins in 10 minutes.
I’m sure your answer is D. 180 - 125 will get you 55.!
Have a nice day!
