Jennifer stops at Tim Hortons before work to buy coffee and donuts for her and her co-workers. After buying 5.00 worth of donuts and all her coffees at 1.29 each, her total was 11.45. How many coffees did she purchase?

She purchased 5 coffees

Step-by-step explanation:

$5.00+$1.29c=$11.45

Subtract $5.00 on both sides:

$5.00-$5.00+$1.29c=$11.45-$5.00

$1.29c=$6.45

Divide 1.29 on both sides:

1.29c/1.29=6.45/1.29

c=5 coffees

answer: 21$

step-by-step explanation:

$42 / $14 = 3   (ratio 3: 1)

$7 x 3 = $21

1. perpendicular

2. parallel

3. perpendicular