Solve triangle ABC. Round side lengths and angle measures to the nearest tenth when necessary.b = 2, c = 3, A = 80°
A. a ? 2.3, B ? 63.4°, C ? 36.6°
B. a ? 3.3, B ? 63.4°, C ? 36.6°
C. a ? 4.3, B ? 36.6°, C ? 63.4°
D. a ? 3.3, B ? 36.6°, C ? 63.4°
Answer: D
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Solve.The planets in a certain solar system have a path that is an ellipse, with Star A as one of the foci. Planet X has a perihelion of 588.6 million miles and an aphelion of 631.8 miles. Find an equation for Planet X's orbit. Express your answer with a and b in millions of miles, rounded to the nearest tenth of a million.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Solve.There are currently 57 million cars in a certain country, decreasing by 0.5% annually. How many years will it take for this country to have 39 million cars? Round to the nearest year.
A. 578 yr B. 76 yr C. 5 yr D. 36 yr
First, write the value(s) that make the denominator(s) zero. Then solve the equation.
+ 8 = 
A. x ? 0, 3; 
B. x ? 0; 
C. No restrictions; 
D. x ? 0; 
Solve the problem.In how many ways can 7 people be chosen and arranged in a straight line, if there are 11 people from whom to choose?
A. 77 ways B. 1,663,200 ways C. 15,840 ways D. 7920 ways