So, the answer to this problem is x = 9/2 or x = 4.5.
7. Let f(x) = 3x and g(x) = (x + 2)^2. Find the value of (f og)(-5)
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So, the answer to this problem is x = 9/2 or x = 4.5.
126 liters of pure water should be added
<em><u>Solution:</u></em>
Let "x" be the liters of pure water
Then, 18 + x is the liters of final solution
18 Liter solution of 80% acid, which means 100 - 80 = 20 % of water is used
Pure water is 100%
Then according to question, we can say,
"x" liters of pure water 100 % is mixed with a 18 liter solution of 20 % water to produce a mixture (18 + x) liter that is 90 % water
Thus we frame a equation as:
Equation:
water + water = water
Thus 126 liters of pure water should be added