Use the summation properties to evaluate the series. The following rules may be needed: 
.
A. 112
B. 441
C. 1764
D. 462
Answer: A
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Simplify the expression.8b - 4b + 4
A. 12b + 4 B. 8b C. -4b + 4 D. 4b + 4
Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.1.7x + 12.6y - 4.7z = 1.95.0x - 7.0y - 1.2z = -4.83.1x + 4.0y - 3.5z = 11.8
A. {(-94.5, -40.1, -143.3)} B. {(-34.6, -14.7, -52.4)} C. {(-23.0, -9.8, -35.0)} D. {(57.6, 24.4, 87.4)}
Solve the problem.On a recent trip, Sarah's car traveled 20 mph faster on the first 120 miles than it did on the remaining 80 miles. The total time for the trip was 4 hr. Find the speed of Sarah's car on the first part of the trip.
A. 60 mph B. 10 mph C. 40 mph D. 35 mph
Answer the question.Which one of the equations below matches the graph?
A. y = 4 sin
B. y = 2 cos
C. y = 4 cos
D. y = 4 cos