Solve the problem.Find the hydrogen ion concentration of a solution whose pH is 6.5. Use the formula 
A. 3.16 × 10-7
B. 0.81291336
C. -0.8129134
D. 3.16 × 106
Answer: A
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Using the Superposition Theorem, find IR3 and VR3 .
E1 = 9.0 V
E2 = 12.0 V
R1 = 3 Kê
R2 = 1 Kê
R3 = 5 Kê
Graph the ellipse and locate the foci.4x2 + 9y2 = 36
A. foci at (
, 0) and (-
, 0)
B. foci at (
, 0) and (-
, 0)
C. foci at (2
, 0) and (-2
, 0)
D. foci at (0, 
) and (0, -
)
Solve the problem.The table below summarizes the plays that a football team made while in possession of the football during their last game. 
If the total yards gained in small gains were combined with the total yards lost in small losses, what would be the result?
A. A gain of 30 yards B. A loss of 30 yards C. A loss of 6 yards D. A gain of 70 yards
Solve the problem.The volume of a right cylindrical cone of height 6 cm and radius r cm is 
cubic centimeters 
Find the instantaneous rate of change of the volume with respect to the radius r when r = 4 cm.
A. 4? cm3/cm B. 16 cm3/cm C. 16? cm3/cm D. 32? cm3/cm