Answer:
x=-5/2+3y
Step-by-step explanation:
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R; all quadratic functions are going to have *ALL REAL NUMBERS*.
Cycling = 69 - (32 + 27) = 69 -59 = 10
Badminton = 62 - (32+28) = 62 - 60 =2
Archery = 63 - (27 + 28) = 63 - 55 = 8
Total for 1 sport = 10 + 2 + 8 = 20
Pupils left = 120 - 20 = 100
Pupils that picked two sports = 27 + 28 + 32 = 87
Number of pupils to pick all sports = 100 - 87 = 13
13 pupils picked all three
(-3s +2t)(4s -t) = -12s^2 +3st +8st -2t^2 = -12s^2 +11st -2t^2 so the last one choice is right sure
The rate of Sue is 1 car per hour: 1 (c/h)
then the rate of Steve is 2 (c/h) , because Steve works faster, he can wash twice the number of cars, for the same amount of time.
Thus If Steve and Sue work together, they can wash 1 + 2 = 3
(cars per hour).
That is, the rate of Steve and Sue working together, is 3 (c/h).
In the first 30 minutes, Sue washes half of the car.
The remaining half will be washed at a rate of 3 (c/h)
The main formula is Work = Time * Rate
where Work is washing (1/2)c, and rate is 3(c/h)
Time=Work/Rate =
![\frac{ \frac{1}{2} c}{3 \frac{c}{h} }= \frac{1}{6}h](https://tex.z-dn.net/?f=%20%5Cfrac%7B%20%5Cfrac%7B1%7D%7B2%7D%20c%7D%7B3%20%5Cfrac%7Bc%7D%7Bh%7D%20%7D%3D%20%5Cfrac%7B1%7D%7B6%7Dh%20)
1/ 6 h =(1/6)*60 min = 10 min
Answer: 10 min