The pH of a solution is given by the formula 
, where 
is the concentration of hydrogen ions in moles per liter in the solution. Use this formula to solve the problem.Find the pH value of a sample of lake for which [H+] = 0.00000000305. Round to the nearest tenth.
A. 8.5
B. 7.3
C. 6.4
D. 10.1
Answer: A
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Give a geometric description of the set of points whose coordinates satisfy the given conditions. x2 + y2 + z2 > 36
A. All points on the surface of the cylinder with radius 6 B. All points outside the cylinder with radius 6 C. All points outside the sphere of radius 6 D. All points in space
Provide an appropriate response. A small office manager wants to buy new cordless phones for each of the office's 11 desks. Each phone costs $89.99. Estimate the total cost by using numbers with one nonzero digit. Find the exact amount.
A. $900; $898.98 B. $900; $989.89 C. $800; $989.89 D. $800; $989.99
Express the amount as a positive or negative integer.In one state, the lowest point is 5233 feet below sea level.
A. -5233 B. 5233
Find the slope of the line.x = -4
A. 0 B. undefined C. 4 D. -4