Multiply.
2
A. 25x4 - 20x2y3 + 4b2
B. 25x4 - 10x2y3 - 4y6
C. 25x4 - 20x2y3 + 4y6
D. 25x4 + 4y6
Answer: C
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Solve the problem.Martha can rake the leaves in her yard in 8 hours. Her brother can do the job in 2 hours. How long will it take them to do the job working together?
A. 
hr
B. 
hr
C. 
hr
D. 
hr
Graph the system of inequalities.y < -x + 10y > 9x - 3
A. 
B. 
C. 
D. 
Solve the problem.The following graph shows the private, public and total national school enrollment for students for select years from 1970 through 2000.
i) How is the graph for total school enrollment, T, determined from the graph of the private enrollment, r, and the public enrollment, u?ii) During which 10-year period did the total number of students enrolled increase the least?iii) During which 10-year period did the total number of students enrolled increase the most?
A.
| i) | T is the sum of r and u. |
iii) 1970-1980
B.
| i) | T is the sum of r and u. |
iii) 1980-1990
C.
| i) | T is the sum of r and u. |
iii) 1990-2000
D.
| i) | T is the difference of r and u. |
iii) 1990-2000
The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = ln(t3 - 5t2 + 5)i - 
j - 3cos(t)k
A. v(0) = 
i - 
j + 3k
B. v(0) = 
i - 
j
C. v(0) = - 
j
D. v(0) = 
j