Respuesta :

altavistard

Answer:

$0.70/pen; 3 pens for $2.10.

Step-by-step explanation:

(a) Find the unit rate (cost per pen):

$2.80

----------- = $0.70/pen

4 pens

(b) Find the cost of 3 pens.  To do this, mult. the unit rate by 3:

$0.70

----------- * 3 pens = $2.10

   pen

taYODAda
It is 70 cents per pen because to find one pen, you do $2.80 divided by 4. To find three pens, you times the answer of 2.80 divided by 4, which is 0.70, by 3.

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