Function Rules

What is the function rule for the total cost (C) of buying notebooks if each notebook (n) costs $2.50?

• C = 2.50n

• C = n + 2.50

• C = 2.50 + n

• C = n/2.50

What is the function rule for the distance (d) traveled at a constant speed of 65 miles per hour (h)?

• d = 65h

• d = h/65

• d = 65 + h

• d = 65 - h

What is the function rule for the perimeter (P) of a rectangle with a fixed width of 5 units and a variable length (l)?

• P = 2(5 + l)

• P = 5l

• P = 5 + l

• P = 5l + 2

What is the function rule for the amount of change (ch) from a $20 bill after buying an item with a price (p)?

• ch = 20 - p

• ch = p - 20

• ch = 20 + p

• ch = 20p

What is the function rule for the number of slices per person (s) if a pizza with 12 slices is shared among a number of people (p)?

• s = 12/p

• s = 12p

• s = p/12

• s = 12 + p

What is the function rule for the volume (V) of a cube with side length (s)?

• V = 3s

• V = s + 3

What is the function rule for the total earnings (E) for working a certain number of hours (h) at an hourly rate of $15?

• E = 15h

• E = h/15

• E = 15 + h

• E = 15 - h

What is the function rule for the final grade (G) in a class where homework (h) is worth 30% and the exam (e) is worth 70% (grades are out of 100)?

• G = 0.3h + 0.7e

• G = 0.7h + 0.3e

• G = h + e

• G = 0.3e + 0.7h

What is the function rule for the circumference (C) of a circle with a given radius (r)?

• C = 2πr

• C = 2r

• C = πr

What is the function rule for the number of days (d) in a certain number of weeks (w)?

• d = 7w

• d = w/7

• d = 7 + w

• d = 7 - w