Question

5 rubber stamps cost $9.70. Which equation would help determine the cost 1 point

of 11 rubber stamps? Choose 1 answer. *
5
$9.70
11
$9.70
11
OA)
B)
$9.70
650.70
5
11
$9.70
OC)
OD)

Answer 1

None of the above

Explanation:

I did the test on khan

Answer 2

The equation would help determine the cost 1 rubber stamps will be:

`(9.7)/(5)=(x)/(11)`

Explanation:

Let x be the cost of 11 rubbers.

As the cost of 5 rubber stamps is $9.70.

Thus, the cost of 11 rubbers can be determined using the proportional ratios.

`(9.7)/(5)=(x)/(11)`

BONUS! let us solve to check

`(9.7)/(5)=(x)/(11)`

switch sides

`(x)/(11)=(9.7)/(5)`

Multiply both sides by 11

`(11x)/(11)=(9.7\cdot \:11)/(5)`

Simplify

`x=21.34`

Thus, the cost of 11 rubber stamps: x = $21.34

Therefore, the equation would help determine the cost 1 rubber stamps will be:

`(9.7)/(5)=(x)/(11)`

VERIFICIATION

Given

The cost of 5 rubber stamps = $9.70

Thus,

The cost of 1 rubber stamps = 9.70 / 5

= $1.94

If the cost of 1 rubber stamp = $1.94

The cost of 11 rubber stamps = 11 × 1.94

= $21.34