Leo wants to paint a mural that covers a wall with an area of 800 square feet. The height of the wall is 1 /2 of its length. What is the length and the height of the wall?

Area. = length x height

Let x = Length

The height is 1/2x

800 = x * 1/2x

Simplify:

800 = 1/2x^2

Multiply both sides by 2:

1600 = x^2

Take the square root of both sides:

X = sqrt(1600)

X = 40

1/2x = 20

Length = 40 feet

Height = 20 feet

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0