Factor the difference of two squares.81 - 64x2
A. (9 + 8x)2
B. (9 + 8x)(9 - 8x)
C. (9 - 8x)2
D. prime
Answer: B
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Solve the problem.The area A = ?r2 of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when 
A. 20 ft2/ft B. 20? ft2/ft C. 100? ft2/ft D. 10? ft2/ft
Write the whole number in the sentence in standard form.Don figured out that he had lived five hundred eighty-two million, sixteen thousand seconds.
A. 582,160,000 B. 58,216,000 C. 582,000,016,000 D. 582,016,000
Solve the problem.Some values of linear functions f and g are listed in the table below. Find the solution of a system of two equations that describes the functions f and g. HINT: Use the linear regression and graphing functions on a calculator to find and graph equations of f and g.
Find an approximate solution of a system of two equations that describe the functions f and g.
A. (2.8, 31.0) B. (2.7, 39.5) C. (3.8, 36.5) D. (3.1, 28.6)
Without graphing, answer the following questions for the linear system.(i) Is the system inconsistent, are the equations dependent, or neither?(ii) Is the graph a pair of intersecting lines, a pair of parallel lines, or one line?(iii) Does the system have one solution, no solution, or an infinite number of solutions?x + 2y = 0y = - 
x
A. (i) dependent (ii) one line (iii) infinite number of solutions B. (i) neither (ii) intersecting lines (iii) one solution C. (i) inconsistent (ii) parallel lines (iii) no solution