Factor completely.z4 - 5z2 + 4
A. (z2 + 1)(z2 + 4)
B. (z - 1)(z + 1)(z2 + 4)
C. (z - 1)(z + 1)(z - 2)(z + 2)
D. (z2 + 1)(z - 2)(z + 2)
Answer: C
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Solve the system by either elimination or substitution. Verify your work by using "intersect" on your graphing calculator of by checking that your result satisfies both equations of the system.
A. (-4.4, 17) B. (17, -4.4) C. empty set solution; inconsistent system D. all points on the line 2x + 5y = 12; dependent system
Solve.On an architect's blueprint, 1 inch corresponds to 4 feet. Find the length of a wall represented by a line 
inches long on the blueprint. Round to the nearest tenth if necessary.
A. 17.5 feet B. 8.4 feet C. 118.8 feet D. 19 feet
Let x represent one number and let y represent the other number. Use the given conditions to write a system of nonlinear equations. Solve the system and find the numbers.The sum of the squares of two numbers is 45. The sum of the two numbers is 9. Find the two numbers.
A. -6 and -3 B. 3 and 6 C. 3 and 6; -6 and -3 D. -6 and 3; -3 and 6
Solve for the variable.-2a + 4 + 3a = 6 - 28
A. -38 B. 26 C. -26 D. 38