Question

If the cost of a telephone conversation varies directly as the length of the time of conversation, and if the cost of six minutes is $0.90, what would be the cost for a nine-minute call?

Answer 1

it would cost $1.35

.9 divided by 6 = .15

.15 times 9 = $1.35

Answer 2

Answer:  $1.35

Step-by-step explanation:

we already know that the cost of six minute calls is equal to $0.90, but we are ask to find the cost for nine minute. To solve this, we will need to use proprtion. Thus;

using proportion,

6 minutes  = $0. 90

 9 minutes  =  x

cross multiply

6 × x  =  0. 90  ×  9

6x  =  8. 1

Now, to solve for x, will have to make x subject of the formula, to do that we will divide both-side of the equation by  6

6x/6  =  8.1/6

x  =  $1. 35

Therefore the cost for a nine- minute call is $1. 35