Multiply.(3x + 7y)(3x- 7y)
A. 9x2 - 49y2
B. 9x2 - 21xy + 49y2
C. 9x2 + 49y2
D. 9x2 - 21xy - 49y2
Answer: A
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Solve the problem. Round your answer, if appropriate.Water is discharged from a pipeline at a velocity v (in ft/sec) given by 
where p is the pressure (in psi). If the water pressure is changing at a rate of 
find the acceleration (dv/dt) of the water when 
A. 55.8 ft/sec2 B. 2790 ft/sec2 C. 82.1 ft/sec2 D. 164 ft/sec2
Add as indicated.(5x2 + 5xy + y2) + (5x2 + 3xy - y2) + (x2 + xy - y2)
A. 11x2 + 9xy - y2 B. 10x2 + 8xy - y2 C. 9x2 + 7xy - y2 D. 11x2 + 9xy + y2
Factor completely.3x2 - 9xy - 12y2
A. 3(x + y)(x - 4y) B. 3(x - y)(x + 4y) C. prime D. (3x - 3y)(x + 4y)
Factor completely. If the polynomial is prime, then state this as your answer.a2 + 12a + 32
A. (a - 4)(a + 8) B. (a - 4)(a + 1) C. (a + 4)(a + 8) D. prime