Arectangle's length is 4 feet more than it's width. if the area of the rectangle is 396 square feet, what is its width, in feet?

18 feet

Step-by-step explanation:

Let the width of the rectangle to be x.

Therefore, the length which is 4 feet more than the width will be = x + 4

We know that the Area of a rectangle = L x W, so we will substitute the values of area, length and width in it to get:

Area = L x W

396 = (x + 4) (x)

396 = x^2 + 4x

x^2 + 4x - 396 = 0

Now we will factorize this quadratic equation:

x^2 + 4x - 396 = 0

x^2 + 22x - 18x -396 = 0

x (x + 22) - 18 (x + 22) = 0

x = -22 (ignore) and x = 18

So width is 18 feet and by adding 4 to it we can know the length which is 18 + 4 = 22 feet.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

idk

step-by-step explanation: