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. 2?
C. 
?
D. 
?
Answer: C
Mathematics
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Graph the inequality on a number line.x ? 6
A. 
B. 
C. 
D. 
Mathematics
Decide whether the set is countably infinite. Answer yes or no. ? Set of even numbers.
What will be an ideal response?
Mathematics
Determine whether the variation model is of the form 
or 
and find k. Then write a model that relates y and x.
x
5
10
15
20
25
y
-1.5
-3
-4.5
-6
-7.5
A. 
B. 
C. 
D. 
E. 
Mathematics
Solve the problem.Joel has started a business mowing lawns for the summer. The bar graph below tracks his net income for five weeks. 
Find the difference in Joel's net income between week 5 and week 4.
A. $40 B. $258 C. $30 D. $248
Mathematics