Solve.An express and local train leave Grayslake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.
A. Express's rate = 25 mph and local's rate = 12.5 mph.
B. Express's rate = 60 mph and local's rate = 30 mph.
C. Express's rate = 50 mph and local's rate = 25 mph.
D. Cannot be determined with information given.
Answer: C
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Find the exact value by using a sum or difference identity.cos 75°
A. - 
B. 
C. 
D. - 
Use the quotient rule to divide and simplify.
A. 
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Find the center (h, k) and radius r of the circle with the given equation. (x + 5)2 + (y + 7)2 = 49
A. (h, k) = (-5, -7); r = 49 B. (h, k) = (-5, -7); r = 7 C. (h, k) = (-7, -5); r = 7 D. (h, k) = (-7, -5); r = 49