To practice, what if the two are added now? lets add one term at a time. first the x terms. 3x+x= 4x. then y+-3y=-2y. finally 3+-2=1. now putting them together we get 4x-2y=1.
multiplying the first equation by 3 gets us 9x+3y=9. basically multiplying each term by 3. now just do the same thing from the first part, so start with the new 9x+x and continue
85 x 45/60 = 63.75 km
118 x 16/60 = 31.47 km
43 x 13/60 = 9.32 km
63.75 + 31.47 + 9.32 = 104.54 km
45 + 16 + 19 + 13 = 93 min = 1.55 hours
104.54 ÷ 1.55 = 67.45 km/h
Answer:
28.27
Step-by-step explanation:
Area of a circle A≈ πr2
3.14 x 3^2 ≈ 28.27