Solve the system of equations by the substitution method. Check your solutions. For any dependent equations, write your answer in ordered pair form.
A. {(-6, -8)}
B. {(6, 8)}
C. {(6, -8)}
D. {(-6, 8)}
Answer: C
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Solve the equation.(6.2)2 = (13.3)2 + (15.5)2 - 2(13.3)(15.5)cos ? for 0° < ? < 90°
A. 58.1 B. 25.3° C. 21.3° D. 23.3°
A 5 æF capacitor is charged from a 100 V source through a 15 Kê resistor. Find VC when t = 150 msec.
a. 37.5 V b. 67.3 V c. 86.5 V d. 93.3 V e. 95.6 V
Find the derivative of the function at the given point in the direction of A.
A = 4i - 3j
A. 
B. 
C. 
D. 3
Solve the problem.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 = 60 mph and local's rate = 30 mph. B. Express's rate = 25 mph and local's rate = 12.5 mph. C. Express's rate = 50 mph and local's rate = 25 mph. D. Cannot be determined with information given.