Kelly sells 11 pens for $8.25.

how many pens does kelly sell if earns $13.50?

enter your answer in the box

11 pens=8.25
8.25 divided by 11= 0.75
13.50 divided by 0.75=18
I think Kelly sold 18 pens

So 11 for 8.25
to find the cost of each separate pen we will divide the cost / the amount of pens
so 8.25/11
that it 0.75
she sells each pen for 0.75

to find out how many pens she sold to earn 13.50 we will divide it by the cost of the pens
so
13.5 / 0.75
She sells 18 pens to earn $13.50

Hope this helps :)

1

Step-by-step explanation:

Here f(x) = x^2 - 2x - 5, which at x - -5 is 25 +10 - 5 = 30 and at x = 6 is 19.

The average value of a function f(x) over an interval [a, b] is

                  f(b) - f(a)

ave. val. =

                     b - a

which in this particular case is

                     19 - 30

ave. val. = = -11/11 = 1

                     6 - (-5)

The average value of this function f(x) = x^2 - 2x - 5 on [-5, 6] is 1.