Use rational equations to solve the problems.A loaded moving truck is traveling 20 mph faster than a freight train. In the time it takes the train to travel 60 miles, the truck travels 100 miles. Find the speed of the truck.
A. 20 mph
B. 100 mph
C. 50 mph
D. 10 mph
Answer: C
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Use scientific notation to solve the problem.Assume that the volume of the earth is 5 x 1014 cubic meters and the volume of a bacterium is 2.5 x 10-16 cubic meters. If the earth could be filled with bacteria, how many would it contain?
A. 5.0 x 10-31 bacteria B. 5.0 x 1031 bacteria C. 2.0 x 1030 bacteria D. 2.0 x 10-30 bacteria
Solve the problem.Given that the polar equation r = 
models the orbits of the planets, estimate the closest approach of Pluto's orbit, for which 
and 
to the sun.
A. About 74 astronomical units B. About 30 astronomical units C. About 39 astronomical units D. About 50 astronomical units
Find the exact value under the given conditions.cos ? = 
, 0 < ? < 
; sin ? = - 
, - 
< ? < 0Find tan(? + ?).
A. 
B. 
C. 
D. 
Solve the equation.log4(x - 4) = 3
A. {85} B. {77} C. {60} D. {68}