Reflection is the correct answer !
Answer:
You forgot to put the picture please redo and ill edit my answer
Step-by-step explanation:
The answer is 2230. You have to round 27 to the nearest ten and it’s 30 so it’s 2230
Answer:
5 km/h
Step-by-step explanation:
Let x km/h be Ed's rate in the evening, then x+1 km/h is his rate in the morning. It takes him
hours in the morning to pass 12 km;
hours in the evening to pass 12 km.
In total, it takes him 5 hours 24 minutes (
hours), then
![\dfrac{12}{x+1}+\dfrac{12}{x}=5.4.](https://tex.z-dn.net/?f=%5Cdfrac%7B12%7D%7Bx%2B1%7D%2B%5Cdfrac%7B12%7D%7Bx%7D%3D5.4.)
Solve this equation:
![\dfrac{12x+12(x+1)}{(x+1)x}=5.4,\\ \\12x+12x+12=5.4x^2+5.4x,\\ \\5.4x^2 -18.6x-12=0,\\ \\54x^2-186x-120=0,\\ \\9x^2 -31x-20=0,\\ \\D=(-31)^2-4\cdot 9\cdot (-20)=1,681=41^2,\\ \\x_{1,2}=\dfrac{-(-31)\pm\sqrt{41^2}}{2\cdot 9}=\dfrac{31\pm41}{18}=-\dfrac{5}{9},\ 4\ km/h.](https://tex.z-dn.net/?f=%5Cdfrac%7B12x%2B12%28x%2B1%29%7D%7B%28x%2B1%29x%7D%3D5.4%2C%5C%5C%20%5C%5C12x%2B12x%2B12%3D5.4x%5E2%2B5.4x%2C%5C%5C%20%5C%5C5.4x%5E2%20-18.6x-12%3D0%2C%5C%5C%20%5C%5C54x%5E2-186x-120%3D0%2C%5C%5C%20%5C%5C9x%5E2%20-31x-20%3D0%2C%5C%5C%20%5C%5CD%3D%28-31%29%5E2-4%5Ccdot%209%5Ccdot%20%28-20%29%3D1%2C681%3D41%5E2%2C%5C%5C%20%5C%5Cx_%7B1%2C2%7D%3D%5Cdfrac%7B-%28-31%29%5Cpm%5Csqrt%7B41%5E2%7D%7D%7B2%5Ccdot%209%7D%3D%5Cdfrac%7B31%5Cpm41%7D%7B18%7D%3D-%5Cdfrac%7B5%7D%7B9%7D%2C%5C%204%5C%20km%2Fh.)
Ed's rate cannot be negative, thus x=4 km/h. His morning rate is x+1=5 km/h.