Answer:
15a + 12
Step-by-step explanation:
3*5a=15a
3*4=12
=15a+12
6 mins goes into 60 mins ten times.
so, first do

now 50000 crauons are being made in 1 hour but your are trying to find how many crayons are being made in 3 hours
so, you multiply

150000 is how many crayons are made in 3 hours.
<span><span /></span>A. using a calculator help a lot you know
It helps you know what to multiply and the product when you subtracting and adding fractions.
10 minutes at 2 meters/second
1 minute = 60 seconds
10 minutes = 600 seconds.
600 seconds at 2 meters/second
2 meters × 600 = total distance
1200 meters <em>or</em> 1.2 km