A high-speed elevator can rise 360 feet in 20 seconds. Which expression represents the rate, in feet per second, of the elevator? 360 x 20
360 ÷ 20
360 x 3
360 ÷ 3

360/20

Step-by-step explanation:

20 sec = 360 feet

feet per second means how many feet for every 1 second so

1 sec = 360/20 feet

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x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)