Use common or natural logarithms to solve the exponential equation symbolically.5-x = 
A. x = - ln 25
B. x = ln 
C. x = - 
D. x = 
Answer: D
Mathematics
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Solve the problem.The hydrogen ion concentration of a substance
is about 2.9 x 10-12 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. -12.5 B. 12.5 C. 11.5 D. 11.8
Mathematics
Solve the equation. Don't forget to first simplify each side of the equation, if possible.-7k + 3 + 8k = 15 - 26
A. -44 B. 14 C. -14 D. 44
Mathematics
Evaluate.
A. 
e4y + C
B. 4e4y + C
C. 
e4y + C
D. 2e4y + C
Mathematics
Perform the indicated operations and simplify the result. Leave the answer in factored form.
? 
A. - 
B. 
C. - 
D. - 
Mathematics