Solve the problem.Let u = 3i, v = i + j. Find 6u + v.
A. 19i + j
B. i + 19j
C. 19i + 6j
D. 11i + j
Answer: A
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Use the quadratic formula to find the exact solutions.3t2 - 7t = 1
A. 
± 
i
B. 
C. - 
± 
i
D. 
Solve the problem.The weight of a body above the surface of the earth is inversely proportional to the square of its distance from the water of the earth. What is the effect on the weight when the distance is multiplied by 3?
A. The weight is multiplied by 3. B. The weight is divided by 3. C. The weight is multiplied by 9. D. The weight is divided by 9.
Build a variable expression for the given phrase.Eight times a number
A. 8 - x
B. 8x
C. 
D. 8 + x
Solve the problem.S(x) = -x3 - 3x2 + 72x + 900, x ? 2 is an approximation to the number of salmon swimming upstream to spawn, where x represents the water temperature in degrees Celsius. Find the temperature that produces the maximum number of salmon.
A. 6°C B. 8°C C. 4°C D. 2°C