Question

Line GuideXReset AnswerA linear function models the cost based on the number of toothbrushes made.Which statement about the rate of change of this function is true?The cost increases by $1.50 for each additional toothbrush made.At a factory, the cost of making different numbers of toothbrushes isshown in the table below.COST OF TOOTHBRUSHESNumber ofToothbrushes3 6 9 12Cost (dollars) $4.50 $9.00 $13.50 $18.00B The cost increases by $4.50 for each additional toothbrush made.The cost increases by 59.00 for each additional 3 toothbrushes made.D The cost increases by $18.00 for each additional 3 toothbrushes made.

Answer 1

From the table, notice that the cost increases by $4.50 for each additional 3 toothbrushes made.

Divide 4.50 over 3 to find the cost of each toothbrush:

`(4.50)/(3)=1.50`

Then, the cost increases by $1.50 for each additional toothbrush made.

Therefore, the correct choice is option A.