If A is equal to 30, and A+B equals 42. That means B equals 12. So, if the value increased with the same rate of change, it would be 54. This is because 30 plus 12 is 42. 42 plus 12 would equal 54.
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<u>The length of the strip is equal to perimeter of the kitchen.</u>
<u>Cost of the strip is:</u>
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