Find the volume under the surface z = f(x,y) and above the rectangle with the given boundaries.z = 6x2y; 0 ? x ? 4, 0 ? y ? 3
A. 676
B. 2256
C. 1256
D. 576
Answer: D
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Beginning in 2001 the price, in dollars per ounce, of gold was modeled approximately by
,
where t is the time in years since the beginning of 2001.A: Make a graph of G versus t that shows estimated gold prices for 2001 to 2010.B: A broker recommended purchase of gold as long as the price was between $400 and $700 per ounce. Add the horizontal lines 
and 
to your graph.C: During what time period was the purchase of gold advised? Give your answer in terms of t correct to two decimal places.
What will be an ideal response?
Using determinants, solve the following for x, y, and z:
x + 2y + z = 3 2x + y + 4z = 10 3x + 4y - z = 7 a. 58 18 7 x = ÄÄ y = ÄÄ z = ÄÄ 16 16 16 b. 58 12 14 x = ÄÄ y = - ÄÄ z = ÄÄ 16 16 16 c. 29 11 14 x = ÄÄ y = - ÄÄ z = ÄÄ 16 16 16 d. 58 20 20 x = ÄÄ y = - ÄÄ z = ÄÄ 16 16 16 e. 29 18 14 x = ÄÄ y = ÄÄ z = ÄÄ 16 16 16
Find the sum without the use of a number line.2 + (-19) + 2 + (-19) + 16 + (-16)
A. 0 B. -38 C. -74 D. -34
Complete the square. Then write the perfect-square trinomial in factored form.x2 + 8x
A. x2 + 8x + 16; (x + 4)2 B. x2 + 8x + 64; (x + 8)2 C. x2 + 8x; (x + 4)2 D. x2 + 8x + 16; (x - 4)2