( THIS A QUICK ONE ) Jack drove 360 miles on his trip. If he was going 60 miles per hour, how many hours did he drive?

6 hours

360/60 = 6 (hours)

Step-by-step explanation:

Collin invested $5529 in the account paying 2% and $2171 in the account paying 9% interest.

Explanation:

Let x be amount invested at 2%

So, 7700 - x will be the amount invested at 9%

0.02(x) + 0.09(7800 - x) = 315

0.02x + 702 - 0.09x = 315

-0.07x = -387

x = $5529

7700 - x = 7700 - 5529

             = $2171

Collin invested $5529 in the account paying 2% and $2171 in the account paying 9% interest.