Yesterday karen went on a bike ride. her average speed was 10 mph. today she went on another ride this time averaging 12 mph. in the two days she biked for a combined total time of nine hours let xp the number of hours. let x be the number of hours she biked yesterday. write an expression for the combined total number of hours she biked in two days
1. you know that the high-speed camera is ready to film him between 15 meters and 10 meters above the ground.
2. the problem gives you the following equation:
3. therefore, you must calculate the time when and when , as following:
4. therefore, the answer is:
-11/10 or -1.1
to start, let's get rid of those pesky decimals by multiplying everything by 2. then we get 9 + 20r = -13. now, let's isolate the r by subtracting 9 from both sides to get 20r = -22. finally, we need to divide everything by 20 to get r = -11/10 or -1.1.