At joe’s cafe one cup of coffe and 3 donughts cost 2.80 and two cups of coffee and two doughnuts cost 3.20 you may find it to use this diagram that was used by a student to solve this problem

hello welcome to here's your answer

Step-by-step explanation:

Let One Cup of Coffee is X and one doughnut be Y

So X+3Y=4.10 and 2X+2Y=4.60 => X +Y=2.30

=> X+3Y-(X+Y)=4.10-2.30 => 2Y=1.80 => Y=0.90

and X+0,90=2.30 => X=2.30-0.90=1.40

So answer is 1 cup of coffee is $1.40 and one doughnut is $0.90

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3

600,000,000,000, or 6e14

step-by-step explanation: