convert inches to feet
3/12 = 0.25 feet so 12'3" = 12.25 feet
4/12 = 0.33 feet so 18'4" = 18.33 feet
now multiply both of them
12.25 x 18.33 = 224.54 square feet
We begin with 100 mL of the 2% saline solution, and will add x mL of the 0.5% saline solution. The total volume of the mixture will be (100 + x) mL. The total mass of salt will be:
(100)(2%) + (x)(0.5%) = 2 + 0.005x
This would have to be 0.79% of the total volume:
(100+x)(0.79%) = 0.79 + 0.0079x
Equating:
x = 417.24 mL
Answer:
(x-2)(x^2+1)
Step-by-step explanation:
