A substance has a hydrogen ion concentration of  figure 1.png)
. Find the pH of the substance.
What will be an ideal response?
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Provide an appropriate response.
This figure shows a circular sheet of metal with diameter of 20 inches, containing 12 equally spaced holes. Determine the distance between the center of the holes. 
A. 1.941 in. B. 7.244 in. C. 14.49 in. D. 3.882 in.
A swimming pool contains 32,000 gallons of water. How many gallons of chlorine must be added to "shock the pool" and bring the water to a 
% solution?
?
Please enter your answer as a number without the units. Round the answer to the nearest hundredth.
Fill in the blank(s) with the appropriate word(s).
Solve the equation.x2 = -7x
A. {-7} B. {0, -7} C. {7} D. {0, 7}
Solve the problem.Looking ahead to retirement, you sign up for automatic savings in a fixed-income 401K plan that pays 10% per year compounded annually. You plan to invest $2500 at the end of each year for the next 30 years. How much will your account have in it at the end of 30 years? Round to the nearest dollar.
A. $412,533 B. $409,692 C. $413,005 D. $411,235