Find the volume of the indicated region.the tetrahedron bounded by the coordinate planes and the plane 
A. 16
B. 24
C. 8
D. 12
Answer: C
Mathematics
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Find the first term a1 and the common difference d of the arithmetic sequence.an = 6n + 7
A. a1 = 13, d = 7 B. a1 = 7, d = 19 C. a1 = 19, d = 13 D. a1 = 13, d = 6
Mathematics
Find the center (h, k) and radius r of the circle with the given equation. x2 - 2x + 1 + (y + 3)2 = 49
A. (h, k) = (3, -1); r = 49 B. (h, k) = (1, -3); r = 7 C. (h, k) = (-3, 1); r = 7 D. (h, k) = (-1, 3); r = 49
Mathematics
Solve the problem.From a boat on the lake, the angle of elevation to the top of a cliff is 35°44'. If the base of the cliff is 2,260 feet from the boat, how high is the cliff (to the nearest foot)?
A. 1,629 ft B. 1,639 ft C. 1,636 ft D. 1,626 ft
Mathematics
Express the sum using summation notation.
+ 
+ 
+ . . . + 
A. 
B. 
C. 
D. 
Mathematics