A solution is an acid if its pH is less than 7 and a base if its pH is greater than 7. The pH is defined by 
where [H+] is the concentration of hydrogen ions in the solution. Use this information to answer the question.A mixture has a pH of 5.8. Find the concentration of hydrogen ions [H+] in the mixture. Is the mixture an acid or a base?
A. 10-5.8, acid
B. 10-5.8, base
C. 105.8, base
D. 105.8, acid
Answer: A
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Suppose an arc of length s lies on the unit circle x2 + y2 = 1, starting at point (1, 0) and terminating at the point (x, y). Use a calculator to find the approximate coordinates (x, y). Round coordinates to four decimal places when appropriate. 
s = -6.2
A. (0.9965, 0.0831) B. (-0.9965, -0.0831) C. (0.0831, 0.9965) D. (0.9965, -0.0831)
Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, give the solution with y arbitrary. 6x + 4y = -4 5x + 7y = 4
A. ? B. {(2, -2)} C. {(-2, -2)} D. {(-2, 2)}
Give the degree of the polynomial (when simplified), and tell whether it is a monomial, a binomial, a trinomial, or none of these.0.4p5 - 0.7p5 + 0.3p5 + 3
A. Degree 1; monomial B. Degree 0; monomial C. Degree 5; none of these D. Degree 5; binomial
The point P on the circle x2 + y2 = r2 that is also on the terminal side of an angle ? in standard position is given. Find the indicated trigonometric function.(-2, 3)Find cot ?.
A. - 
B. 
C. - 
D. - 