Use a graphing calculator to solve the system. Express solutions with approximations to the nearest thousandth. 
x + y = 50.4x - y = 3
A. ?
B. {(4.746, -1.102)}
C. {(-2.947, 8.789)}
D. {(2.258, 2.097)}
Answer: B
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Remove or add parentheses as indicated.Place parentheses to make the equation 
true.
A. None needed. B. a ? (b ÷ b + 5b) = a + 5b C. (a ? b) ÷ (b + 5b) = a + 5b D. a ? b ÷ (b + 5b) = a + 5b
Solve the problem.The speed of a vehicle is inversely proportional to the time it takes to travel a fixed distance. If a vehicle travels a fixed distance at 30 miles per hour in 60 minutes, how fast must it travel to cover the same distance in 25 minutes?
A. 50 mph
B. 
mph
C. 
mph
D. 72 mph
Solve the equation for ? if 
. Give your answer in degrees.
?
sin 2? + cos ? = 0
?
A. 90°, 210°, 270°, 330° B. 30°, 90°, 150°, 270° C. 0°, 120°, 180°, 240° D. 210°, 330° E. 0°, 60°, 180°, 300°
Evaluate the expression without the use of a calculator, and then verify your answer using a calculator.eln 15
A. 15 B. e15 C. ln 15 D. 14