Answer:

Step-by-step explanation:
Cost of one cup of coffee=$2
The original amount of money on the gift card= $30
Juan's expenses in buying coffee, after
morning are
.
The amount of money left,
, on the card
(Original amount)
(Total expenses)

Hence, the equation for,
, the amount of money remaining on the card is

Answer:
Let x and y be the two positive integers the Christopher is thinking.
x is equal to 7
and y =20
Every 60 seconds in Africa a minute passes together we can stop this
X^2=10
x=3.16 (3sig.figs)
Hope this helps :)