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

Mathematics

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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

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Express the amount as a positive or negative integer.In one state, the lowest point is 5233 feet below sea level.

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Find the slope of the line.x = -4

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Mathematics