Decide whether the graph of the equation opens up, down, to the left, or to the right; and whether it is wider, narrower, or the same shape as the graph of 
(or 
).f(x) = -2x2 - 9x
A. Up; narrower
B. Down; wider
C. Down; narrower
D. Up; wider
Answer: C
Mathematics
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Solve the problem by integration.Find the x-coordinate of the centroid of the first-quadrant area bounded by 
and 
A. -2.884 B. -1.442 C. 0.685 D. 1.369
Mathematics
Find the limit.
A. 5
B. -5
C. - 
- 4
D. 
+ 4
Mathematics
Determine the number of significant digits in the given approximate number.7,080
A. 2 B. 3 C. 4 D. 1
Mathematics
Find the value of the missing number.
= -2
A. -8 B. 6 C. -6 D. 8
Mathematics