Decide which problems can be solved by using proportional reasoning. select all that apply

a: yani buys 4 dozen flyers for $7.25.what is the cost of 12 dozen?

b: first-class letters cost $0.49 for the first ounce and $0.22 for each additional ounce. what is the cost of a 5-oz letter?

Step-by-step explanation:

4 doz for 7.25 = 12 doz for x

set up a proportion

 4        12

=   cross multiply

7.25        x

4x = (7.25)(12)

4x = 87

x = 87/4

x = 21.75 <

so we have 0.49 for the first ozand 0.22 for each additional ozand there is 4 additional oz's because 5 - 1 = 4so thats 0.49 + 4(0.22) = 0.49 + 0.88 = $ 1.37 for the cost of a 5 oz letter. <===

really really sorry if i'm

-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

    + 5x   + 5x

-32 = 8x

8         8

- 4= x

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