Find the sum.-10 + (-12)
A. -22
B. -2
C. 2
D. 22
Answer: A
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A solution of 0.5 N acid is known to be 95% ionized. Find [H+], the hydrogen ion concentration.
A. 0.02375 mol/L H+ B. 2.375 mol/L H+ C. 0.95 mol/L H+ D. 0.2375 mol/L H+
Find the midpoint of the line segment joining the two points.(-2, -6) and (3, 9)
A. 
B. 
C. 
D. 
Expand the expression using the Binomial Theorem.(x2 + 4y)4
A. x8 + 12x6y + 96x4y2 + 192x2y3 + 256y4 B. x8 + 16x6y + 96x4y2 + 256x2y3 + 256y4 C. x6 + 16x5y +24x4y2 + 16x2y3 + 4y4 D. x6 + 12x5y + 96x4y2 + 192x2y3 + 256y4
Solve the problem.A zoom lens in a camera makes a rectangular image on the film that is 8 cm × 5 cm. As the lens zooms in and out, the size of the image changes. Find the rate at which the area of the image begins to change (dA/df) if the length of the frame changes at 0.8cm/s and the width of the frame changes at 0.2 cm/s.
A. 1.12 m2/s
B. 
m2/2
C. 7.4 m2/s
D. 5.6 m2/s