Answer:
D is your answer.
Step-by-step explanation:
Surface area is equal to all faces on the prism.
If you simplify it:
(5)(12) + (5)(10) + (12)(10) + (13)(10)
SA = 360 cm^2
Feel free to let me know if you need more help. :)
Also, you're not dumb. Everyone needs help at some point. :)
We have 20% and 70% salt solutions.
We need 9 liters of 50% salt solution.
"t" is liters of twenty % solution "s" is liters of seventy % solution
A) t + s = 9
B) .2t + .7s = (.5 * 9)
Multiplying A) by -.2
A) -.2t + -.2s = -1.8 Adding that to B)
B) .2t + .7s = (.5 * 9)
.5s = 2.7
s = 5.4 liters of 70% salt
A) t + 5.4 = 9
t = 3.6 liters of 20% salt
Source:
http://www.1728.org/mixture.htm
473x6= 2,838
the answer should be 2,838?
The repeating decimal is 4.142857149