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