Rachel works at a bookstore. On Tuesday, she sold twice as many books as she did on Monday. On Wednesday, she sold 6 fewer books than she did on Tuesday. During the three days Rachel sold 19 books. Create an equation that can
be used to find m, the number of books Rachel sold on Monday.
Equation:

  m +2m +(2m -6) = 19

Step-by-step explanation:

m = number of books sold on Monday.

2m = number of books sold on Tuesday, twice as many as Monday.

2m -6 = number of books sold on Wednesday, 6 fewer than Tuesday.

The total number of books sold on the three days gives the equation you're looking for:

  m +2m +(2m -6) = 19

Additional comment

Solving this gives ...

  5m = 25 . . . . add 6

  m = 5 . . . . . divide by 5

5, 10, and 4 books were sold on the three days.

the answer

b. they are parallel and will never intersect.

d 25 pi/6

step-by-step explanation:

the diameter is 10 inches

the radius is 1/2 of the diameter or 5 inches

the area of the circle is

a = pi r^2

  = pi 5^2

  = 25 pi

the slice is 60 degrees of the entire circle.

60 degrees out of 360   60/360 = 1/6

the area of the slice is 1/6 of the circle

a slice = 1/6 a circle

a slice = 1/6 * 25 pi