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. 10.1
C. 7.3
D. 6.4
Answer: A
Mathematics
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Write the division statement that corresponds to the situation. Do not carry out the division.A group of friends go to lunch at a restaurant. The bill for the meal is 
. How much should each person contribute if there are n people?
A. $54.00 B. $54.00n C. n ÷ $54.00 D. $54.00 ÷ n
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Find the distance between the pair of points.(-5, 5) and (5, -7)
A. 22
B. 2
C. 2
D. 244
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Factor the trinomial completely.20z2 - 7z - 6
A. (20z - 3)(z - 6) B. (4z - 3)(5z + 2) C. (4z + 3)(5z - 2) D. (20z - 3)(z + 2)
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Write the expression in the standard form a + bi.9(8 - 9i)
A. 72i - 9i B. 8 - 81i C. 72 + 81i D. 72 - 81i
Mathematics