Susan may pays $2.80 for a gallon of milk. her sister, who lives in another city pays $2.25 for a gallon of milk. If both families use 3 gallons of milk per week, how much more does susan pay for milk in a year? ( assume 52 weeks in a year.)

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

the correct option is b

step-by-step explanation:

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step-by-step explanation:

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a is the best answer choice