17 Nico is saving money for his college education He invests

17) Nico is saving money for his college education. He invests some money at 77%, and $1500 less than that amount at 3 %. The investments produced a total of $185 interest in 1 yr. How much did he invest at each rate?

18)At an important meet, Usain won the men\'s 200 meters in 25.94 seconds. Find his average rate.

19) Two cities are 3280 miles apart. A plane leaves one of them, traveling towards the other at an average speed of 440 miles per hour. At the same time a plane leaves theother, traveling towards the first, at an average speed of 380 miles per hour. How long will it take them to meet?

Solution

17)

x = money invested at 7%

18)

Average Rate = Total Distance / Total Time.

= 200/25.94

= 7.71 m/s

19)

Applying the \"distance formula\" of d =rt

Let t = time traveled

d = rt

3280 =(400+380)t

t = 4.2 hours is 4 hours and 12 minutes.