Basic crochet stitches are called single, double, and triple. Jada measures her average stitch size and sees that a "double crochet" stitch is not really twice as long; it uses 12 inch less than twice as much yarn as a single crochet stitch. Jada's "triple crochet" stitch uses 1 inch less than three times as much yarn as a single crochet stitch. a. Write an expression, in terms of , to represent the following:

Single stitch
Double stitch
Triple stitch
b. Write an expression, in terms of x, to represent the amount of yarn Jada needs to crochet a scarf that inclues 800 single crochet stitches, 400 double crochet stitches, and 200 triple crochet stitches

c. Write an equivalent expression with as few terms as possible

d. If Jada uses 5540 inches of yarn for the entire scarf, what length of yarn does she use for a single crochet stitch?