A ballpoint pen sells for 39 cents. Represent the cost (in dollar) of x pens.
0.39x
To represent the cost (in dollars) of x pens, we need to multiply the cost of a single pen by the number of pens.
The cost of a single pen is 39 cents, which is equivalent to 0.39 dollars.
Therefore, the cost of x pens would be 0.39x dollars.
To represent the cost of x ballpoint pens in dollars, we can multiply the cost of one pen by the number of pens.
The cost of one ballpoint pen is 39 cents, which is equivalent to 0.39 dollars. Therefore, the cost of x pens can be calculated by multiplying the cost per pen (0.39 dollars) by the number of pens (x):
Cost of x pens = 0.39 * x
So, the expression that represents the cost of x ballpoint pens in dollars is 0.39x.