Convert the equation given in rectangular form into polar form.x2 + y2 = 9
A. r = 9
B. r(cos ? + sin ?) = 3
C. r = 3
D. r(cos ? + sin ?) = 9
Answer: C
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If the lines determined by two linear equations meet, then the crossing point corresponds to the solution of the system of two linear equations in two unknowns.
Answer the following statement true (T) or false (F)
Write the complex number in trigonometric form, using degree measure for the argument.4
A. 4(cos 90° + i sin 90°) B. 4(cos 270° + i sin 270°) C. 4(cos 180° + i sin 180°) D. 4(cos 0° + i sin 0°)
Solve.
+ 
= 4
A. -2
B. 0
C. 
, -2
D. 2, -2
Solve. Express the result in scientific notation. If necessary, round the decimal factor to two decimal places.If the mass of an object is 6.50796 × 104 tons and its density is 7.72 × 10-2 tons per cubic foot, find the volume of this object. (Use the formula D = 
.)
A. 84.3 × 105 cubic feet B. 8.43 × 105 cubic feet C. 8.43 × 104 cubic feet D. 8.43 × 106 cubic feet