How many gallons of paint are needed to paint the walls of a rectangular prism-shaped room that is 20 ft by 10 ft and 8 ft high if 1 gallon of paint covers 40 sq ft.?

  12 gallons

Step-by-step explanation:

The perimeter of the room is ...

  20 ft + 10 ft + 20 ft + 10 ft = 60 ft

Then the area of the walls is the product of this and their height:

  area = (60 ft)(8 f) = 480 ft²

The number of gallons required is ...

  (480 ft²)/(40 ft²/gal) = 12 gal

12 gallons of paint are required.

(2x + 16) + (x) = 180

step-by-step explanation:

given,

abcd is a quadrilateral inscribed in a circle

angle a is labeled x plus 16, (x + 16)

angle b is labeled x degrees, (x)

angle c is labeled 6x minus 4, (6x – 4)

angle d is labeled 2x plus 16, (2x + 16)

what equation can be used to solve for angle b?

we know that the sum of the opposite angles of a simple quadrilateral inscribed in a circle is 180 degrees.

angle b is opposite angle d

therefore, angle b + angle d = 180

(x) + (2x + 16) = 180 

same as (2x + 16) + (x) = 180

they used 313 gallons of paint