I need help with this question. The reference is MODULE WCLN and unit 4 Ration and Radical Functions.

The answer is provided, I need an explanation, please.

Unit 4 Self-Assessment Mathematics Pre-Calculus 12 15. a) Kerry rides a 60 km route on his road bike and can average 30 km per hour if there is no head wind or tailwind. For every 5 km of wind Kerry's average speed is affected by 1 km per hour. Write a rational function that calculates the time, 7, it would take Kerry to ride the 60 km route with a wind speed of s . Proficient = 4 Exemplary =5 elf Assessment No Attempt = 0 Beginning = 1 Emerging = 2 Developing = 3 b) Sketch the graph. 22A l19 elf Assessment No Attempt = 0 Beginning = 1 Emerging = 2 Developing = 3 Proficient = 4 Exemplary =5 c) How long would it take Kerry to ride the 60 km if he was riding into a 30 km per hour headwind? elf Assessment No Attempt = 0 Beginning = 1 Emerging = 2 Developing = 3 Proficient = 4 Exemplary =5 d) Calculate the speed of the wind if it took Kerry 1 hour and 42 minutes to ride the 60 km route. elf Assessment No Attempt = 0 Beginning = 1 Emerging = 2 Developing = 3 Proficient = 4 Exemplary =5 Page 21 of 22AM .A Calf-Assessment sment 3-03- . ..". A Self-Assessment Unit 4 Self-Assessment Mathematics Pre-Calculus 12 16. A river boat can travel at 20 km per hour in still water. The boat travels 30 km upstream against the current then turns around and travels the same distance back with the current. If the total trip took 7.5 hours, what is the speed of the current? Solve this question algebraically as well as graphically. op a) Algebra Solution elf a. elf Assessment No Attempt = 0 Beginning = 1 Emerging = 2 Developing = 3 Proficient = 4 Exemplary =5 b) Graphical Solution elf elf Assessment el No Attempt = 0 Beginning = 1 Emerging = 2 ry = Developing = 3 Proficient = 4 Exemplary =5 Page 22 of 22 222020-11-08.jpg (22... 2020-11-08.jpg (22... 2020-11-08J n katmandu... W gr_math_10_chapte.. y! The graph below re... 13 / 13 100% + Mathematics Pre-Calculus 12 Answer Key 15 Kerry rides a 60 km route on his road bike and can average 30 km per hour if there is no head wind or tailwind. For every 5 km of wind Kerry's average speed is affected by 1 km per hour. Write a rational function that calculates the time, 7, it would take Kerry to ride the 60 km route with a wind speed of s . State a reasonable domain. Sketch the graph. How long would it take Kerry to ride the 60 km if he was riding into a 30 km per hour headwind? Calculate the speed of the wind if it took Kerry 1 hour and 42 minutes to ride the 60 km route. (5 marks) 60 T(s) = 1 -S + 30 Domain: {s -50Ss