Solve the direct variation.If s varies directly as the square of t and s = 75 when t = 5, what is the value of s when t = 8?
A. 192
B. 120
C. 15
D. 40
Answer: A
Mathematics
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Write the expression in simplest form. If a radical appears in the denominator, rationalize the denominator.
A. 3ab
B. 3
C. -3a2b
D. 3ab
Mathematics
Find the center of mass of a thin plate covering the given region with the given density function.The region enclosed by the parabolas y = 72 - x2 and y = x2, with density ?(x) = x2
A. 
= 36, 
= 0
B. 
= 0, 
= 
C. 
= 0, 
= 36
D. 
= 0, 
= 72
Mathematics
Fill in the blank with one of the words or phrases listed below. 
A 
equation is one that can be written in the form ax2 + bx + c = 0 where a, b, and c are real numbers and a is not 0.
A. quadratic formula B. quadratic C. completing the square D. discriminant
Mathematics
Express each set in interval notation.
 figure 1.png)
Mathematics