State if the vectors a and b are perpendicular, parallel, or neither. If a and b are parallel, state whether they point in the same direction or in opposite directions.a = 10i + 8j, b = 8i + 7j
A. Parallel, same direction
B. Perpendicular
C. Parallel,opposite directions
D. Neither
Answer: D
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Decide whether or not the modulo system forms a group.{1, 2}; multiplication modulo 3
A. Not a group B. Group
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the 
A. 2.51 × 10-2 B. 3.98 × 10-2 C. 3.98 × 10-3 D. 2.51 × 10-3
Provide an appropriate response.Light with a wavelength of 0.00000046 meters is blue in color. Write 0.00000046 in scientific notation.
A. 4.6 × 10-6 B. 4.6 × 107 C. 4.6 × 10-8 D. 4.6 × 10-7
Write an equation of the tangent line to the graph of y = f(x) at the point on the graph where x has the indicated value.f(x) = (3x2 - 5x - 2)(2x + 3), x = 0
A. y = - 
x - 6
B. y = -19x + 6
C. y = - 
x + 6
D. y = -19x - 6