Riley wants to make 100ml of 25% saline but only has access to 12% and 38% saline mixtures. x= 12% y=38%

x = 50

y = 50

Step-by-step explanation:

.12(100-y) + .38y = 25

x = 50

y = 50

The total inches of the ribbon is 1080 inches, so you can cut 270 in 4 inch pieces

Step-by-step explanation:

First I multiply 6 feet with 15 to get 90. Then I convert the 90 feet into inches which is 1080. So by dividing 1080 by 4, you will get 270 as the final answer

Hope this helped