Solve the problem. Round your answer to the nearest tenth, when appropriate. Use the formula 
, as needed.Find [H3O+] if the pH = 12.
A. 3.0 x 10-12
B. 1.0 x 10-12
C. 1.0 x 1012
D. 2.0 x 1012
Answer: B
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Perform the indicated operations. Write the result in the form a + bj.
A. 
(10 - j)
B. 
(j - 10)
C. 
(10 + j)
D. 
(j - 10)
Express the given complex number in polar form.4.00e3.00j
A. 3.00 ( cos 229.2° + j sin 229.2°) B. 3.00 ( cos 171.9° + j sin 171.9°) C. 4.00 ( cos 171.9° + j sin 171.9°) D. 4.00 ( cos 229.2° + j sin 229.2°)
Find all solutions of the equation.2 cos x - 1 = 0
A. x = 
+ n? or x = 
+ n?
B. x = 
+ 2n? or x = 
+ 2n?
C. x = 
+ 2n? or x = 
+ 2n?
D. x = 
+ n? or x = 
+ n?
Solve the problem.If an object is dropped off of a tower, the velocity, V, of the object after t seconds can be obtained by multiplying t by 32 and adding 10 to the result. Find an equation relating the velocity, V, to the number of seconds, t.
A. V = 
B. V = 42t
C. V = 32t + 10
D. V = 32 + 10t