An 8 1/2 ounce bottle costs $0.99. Calculate the cost per ounce

Step-by-step explanation: Part 1) The units rates are

A)

B)

C)

D)

Part 2) The best buy is the size 48 1/4 we know that To find out the unit rate divide the total cost by the total volume

Part 1) Calculate the unit rate for each size

case A) we have 8 1/2 ounce bottle costs $0.99 Convert mixed number to an improper fraction

Find the unit rate

case B) we have

18 2/2 oz. bottle costs $1.49

Convert mixed number

Find the unit rate

case C) we have

48 1/4 oz. carton costs $2.49

Convert mixed number to an improper fraction

Find the unit rate

case D) we have

64 3/4 oz. carton costs $3.75

Convert mixed number to an improper fraction

Find the unit rate

Part 2) which size is the best buy

we know that

The best buy is the one with the smallest unit rate

so

The best buy is the size 48 1/4 oz

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.  

probability for j is 1/4

while

a is 1/6