Solve the problem.The area of a trapezoid is 72 square feet. If its two bases are 7 and 11 feet, find its height. 
A. 4 ft
B. 1.5 ft
C. 16 ft
D. 8 ft
Answer: D
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Give the value of the function in radians.cos-1 -0.4079
A. 1.991 B. 4.292 C. -0.420 D. 5.133
Solve the problem.Jessie has a ribbon that is 6.3 yards long. He wants to cut it into pieces that are 0.9 yards long. How many 0.9-yard pieces will he get from the ribbon?
A. 7 pieces B. 6 pieces C. 70 pieces D. 8 pieces
Complete the identity.8 sin x cos3 x + 8 sin3 x cos x = ?
A. 4 sin 2x B. 4 cos 2x C. 4 cos x D. 4 sin x
Solve the equation in the complex number system.x5 - 1 = 0
A. 1, cos(36°) + i sin(36°), cos(108°) + i sin(108°), cos(180°)+ i sin(180°), cos(252°) + i sin(252°) B. -1, cos(72°)+ i sin(72°), cos(144°) + i sin(144°), cos(216°) + i sin(216°), cos(288°) + i sin(288°) C. 1, cos(72°) + i sin(72°), cos(144°) + i sin(144°), cos(216°) + i sin(216°),-1 D. 1, cos(72°)+ i sin(72°), cos(144°) + i sin(144°), cos(216°) + i sin(216°), cos(288°) + i sin(288°)