Find the transformation from the uv plane to the xy plane.u = xy, v = 3x
A. x = - 
, y = 
B. x = 
, y = 
C. x = 3v, y = 
D. x = 
, y = 
Answer: B
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Solve problems using a calculator.A local water district purchased its annual supply of water from three different sources. The number of acre-feet purchased and the cost per acre-foot for each source are shown in the following table. Calculate the average cost of water per acre-foot. (Round to the nearest dollar, if necessary.)Source Number of Acre-Feet Cost per Acre-FootReservoir X 1109 $649Well Water 2740 $208State Water 4775 $2896
A. $1748.62 per acre-foot B. $1753.02 per acre-foot C. $1752.98 per acre-foot D. $1747.14 per acre-foot
Solve the equation.(x - 4)(4x + 12) = 0
A. -4, 3
B. - 
, 
C. - 
, 
D. -3 , 4
Identify the number as prime, composite, or neither.139
A. Neither B. Prime C. Composite
Perform the indicated operations. Express the answer as a single polynomial in standard form.9x7(-12x + 2)
A. -90x7 B. -108x + 18 C. -108x8 + 18x7 D. -108x8 + 2