Express the sum using summation notation with a lower limit of summation not necessarily 1 and with k for the index of summation.
+ 
+ 
+ 
+... + 
A. 
B. 
C. 
D. 
Answer: C
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Write the equation for the plane.The plane through the point P(7, -1, 4) and parallel to the plane 
A. -2x - 8y + 8z = 38 B. 4y = 26 C. -2x - 8y + 8z = -26 D. -2x - 8y + 8z = 26
Perform the indicated operation. Assume that all variables are nonnegative.-
? 
A. -
B. 4x2
C. -4x2
D. -
One way to weigh a very light object is to weigh a large number of the items and then divide to find the weight of one item. Before dividing, the weight of the packaging must be subtracted to find the net weight. Complete the table below. 
?
A.
| Net weight: 2160 g |
Weight of one item in milligrams: 4000 mg
B. Net weight: 154.8 g
Weight of one item in grams: 0.29 g
Weight of one item in milligrams: 286.7 mg
C. Net weight: 2160 g
Weight of one item in grams: 4.1 g
Weight of one item in milligrams: 4125.93 mg
D. Net weight: 2228 g
Weight of one item in grams: 2296 g
Weight of one item in milligrams: 4251.85 mg
Ten people are boarding an aircraft. Two have tickets for first class and board before those in the economy class. In how many ways can the ten people board the aircraft? ?
A. 240 B. 48 C. 80,640 D. 12 E. 1,440