Provide an appropriate response.Factor completely: 25x2 - 64y2
A. (5x + 8y)(5x - 8y)
B. (5x - 8y)2
C. (5xy + 8)(5xy - 8)
D. 25(x + 8y)(x - 8y)
Answer: A
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Use scientific notation to solve the problem.Assume that the volume of the earth is 5 x 1014 cubic meters and the volume of a bacterium is 2.5 x 10-16 cubic meters. If the earth could be filled with bacteria, how many would it contain?
A. 2.0 x 10-30 bacteria B. 5.0 x 1031 bacteria C. 2.0 x 1030 bacteria D. 5.0 x 10-31 bacteria
Write the complex number in rectangular form.6(cos 330° + i sin 330°)
A. 3
- 3i
B. 3
+ 3i
C. -3
- 3i
D. -3
+ 3i
Find the length of the third side of the right triangle. Where appropriate, give both an exact answer and an approximation to three decimal places. 
A. 
? 1.548
B. 
? 2.397
C. 
? 5.745
D. 
? 1.244
Solve the system by the method of substitution.
?
?
A. (5, -13), (-4, -22) B. No real solution C. (5, -17), (-4, -26) D. (5, 27), (-4, 18) E. (5, -13)