Solve the system by substitution.x + y = -1x - y = -11
A. ?
B. {(-6, 5)}
C. {(-7, 6)}
D. {(6, 6)}
Answer: B
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Write fraction as a percent. If necessary, round the percentage to the nearest tenth.
A. 1.4% B. 70% C. 14.3% D. 20.4%
Find the circumference of the circle whose radius or diameter is given. Use 
or 
as indicated. r = 161 cm Use ? ? 
.
A. C ? 1012 cm B. C ? 253 cm C. C ? 81,466 cm D. C ? 506 cm
Solve the problem.A water wheel rotates through the angle ?, the water level L behind the wheel changes according to the equation L = 1 - sin ? - 2 cos2 ?where L is measured in inches. Determine the values of ? for which the water level is zero. Find the exact values. Do not use a calculator.
What will be an ideal response?
Find another representation, (r, ?), for the point under the given conditions.
, r < 0 and 2? < ? < 4?
A. 
B. 
C. 
D. 