We can write an equation that says x + 2x = 6. When we solve for x we get x=2. Then we can plug x into the equation x + 2x = 6 or 2 + 4 = 6. So he drove for 2 hours at 10 mph and 4 hours at 20 mph.
Answer: 147 cm²
Step-by-step explanation:
Since it says to use 3 for pi, and the radius is given to us (7 cm), we will plug in and solve for the area.
A = πr²
A = (3)(7)²
A = 147 cm²
Answer:
-12
Step-by-step explanation:
We need to find the lowest common multiple...
multiples of 14 are : 14,28,42,56,70,84,98,112,126,140,154
multiples of 20 are : 20,40,60,80,100,120,140
so the lowest common multiple is 140....so thats 140 minutes....= 2 hrs 20 minutes....from 8:00 = 10:20
so they will both leave at the same time of 10:20 a.m. <==