Spośród funkcji oznaczonych cyframi od 1 do 8 wybierz te, które są kwadratowe i określ ich współczynniki liczbowe.

1. y=2
2. y= -3x^2
3. y= 1/2x - 4
4. y = (x-2)^2
5. y= x(x-1)
6. y= y=x^2 - x^3
7. y= 1/x - x^2
8. y= x(1-x)

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

i think it is 18

step-by-step explanation:

a

step-by-step explanation: