Use the method of variation of parameters to solve the differential equation.3
+ 140
+ 225y = -10e3x
A. y = C1e-45x + C2e-5x/3 + 
e3x
B. y = C1e-45x + C2e-5x/3 - 
e3x
C. y = C1e-45x + C2e-5x/3 - 
e3x
D. y = C1e-45x + C2e5x/3 - 
e3x
Answer: C
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Evaluate each expression without using a calculator. Give the result in degrees.sin-1 
A. 60° B. 45° C. 135° D. 120°
Solve.10,500 college students were asked to name their favorite sport. Of this group, 
said basketball, 
said soccer, 
said baseball, 
said they had no favorite sport, and the remainder said volleyball. How many named each sport? 
A. Basketball: 3,500 Soccer: 2,100 Baseball: 1,800 Volleyball: 2,575 None: 525 B. Basketball: 3,500 Soccer: 2,100 Baseball: 1,750 Volleyball: 2,635 None: 515 C. Basketball: 3,500 Soccer: 2,100 Baseball: 1,750 Volleyball: 2,625 None: 525 D. Basketball: 3,500 Soccer: 2,050 Baseball: 1,750 Volleyball: 2,675 None: 525
Solve the equation.49x3 - x = 0
A. 
B. 
, - 
, 0
C. 
, 0
D. - 
Solve the application problem.The floor of a rectangular storage room is divided into two right triangles by drawing a diagonal. One leg of the resulting triangle, the width of the room, is 
less than two times the other leg, the length of the room. The hypotenuse is 
Find the length and the width of the room.
A. length: 9 ft width: 12 ft B. length: 12 ft width: 18 ft C. length: 9 ft width: 24 ft D. length: 9 ft width: 3 ft