Find the volume of the described solid.The base of a solid is the region between the curve y = 3cos x and the x-axis from x = 0 to x = ?/2. The cross sections perpendicular to the x-axis are isosceles right triangles with one leg on the base of the solid.
A. 
?
B. 
?
C. 
?
D. 2?
Answer: A
Mathematics
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Use the inverse trig functions to express the angle in terms of the indicated unknown side. 
Use one of the inverse trig functions csc-1 or sec-1 to express angle A in terms of c.
A. A = sec-1 
B. A = csc-1 
C. A = sec-1 
D. A = csc-1 
Mathematics
Evaluate the integral.
A. -10 B. 0 C. 5 D. 10
Mathematics
Find an equation for the ellipse described.Center at (0, 0); focus at (0, 7); vertex at (0, 8)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Plot a scatter diagram.Draw a scatter diagram of the given data. Find the equation of the line containing the points 
and 
Graph the line on the scatter diagram.
A. y = -1.8x + 11.02
B. y = -2.49x + 13.55
C. y = 2.26x + 13.05
D. y = -2.26x + 13.05
Mathematics