Write down all the subsets of the given set.{p, q, r}
A. ?, {p}, {q}, {r}, {p, q}, {p, r}, {q, r}
B. {p}, {q}, {r}, {p, q}, {p, r}, {q, r}, {p, q, r}
C. ?, {p}, {q}, {r}, {p, q}, {p, r}, {q, r}, {p, q, r}
D. ?, {p}, {q}, {r}, {p, q}, {p, r}, {q, r}, {p, p}, {q, q}, {r, r}, {p, q, r}
Answer: C
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Identify the fraction as proper or improper.
A. proper B. improper
Solve the problem.Three different high schools plan to order the same three text books. School A plans to order 90 of book 1, 20 of book 2, 80 of book 3. School B plans to order 60 of book 1, 20 of book 2, 20 of book 3. School C plans to order 80 of book 1, 100 of book 2, 70 of book 3. The cost of book 1 is $15 per copy, the cost of book 2 is $20 per copy, and the cost of book 3 is $25 per copy. What matrix product displays the cost to each school of buying the textbooks? Display the two matrices which must be multiplied and their product.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Find the difference. -6.9 - 7.8
A. 0.9 B. -0.9 C. -14.7 D. 14.7
Solve the problem.A person at the top of a 600 foot tall building drops a yellow ball. The height of the yellow ball is given by the equation src="https://sciemce.com/media/4/ppg__tttt0527191430__f1q101g4.jpg" alt="" style="vertical-align: -4.0px;" /> where h is measured in feet and t is the number of seconds since the yellow ball was dropped. Find the time that the balls are the same distance above the ground and find this distance.
A. 4.5 sec; 276 ft
B. 5 sec; 200 ft
C. 3.5 sec; 404 ft
D. 4 sec; 344 ft
where h is measured in feet and t is the number of seconds since the yellow ball was dropped. A second person, in the same building but on a lower floor that is 
from the ground, drops a white ball 
after the yellow ball was dropped. The height of the white ball is given by the equation