Solve the inequality, and then express in interval notation.10x - 4 ? 9x + 3
A. x ? 7; [7, ?)
B. x < 10; (-?, 10)
C. x ? 7; (-?, 7]
D. x > 10; (10, ?)
Answer: A
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Solve the problem.Cory and Melissa are racing electronic cars around a circular track. They begin at the same time going in the same direction. Cory's car completes a revolution in 45 seconds, while Melissa's car completes a revolution in 40 seconds. How long will it take them before both cars reach the starting point again simultaneously?
A. 720 seconds B. 144 seconds C. 72 seconds D. 360 seconds
Perform the operation. Write the answer as a fraction in lowest terms.
? 
A. 
B. 
C. 
D. 
For the given complex number, graph the terminal point of the associated vector.3 + i
A. 
B. 
C. 
D. 
Solve the problem.Ashley's grades on her first 3 exams are 85, 78, and 77. An average greater than or equal to 80 and less than 90 will result in a final grade of B. What range of grades on Ashley's fourth and final exam will result in a final grade of B? The maximum grade is 100.
A. 80 ? x ? 100 B. 70 ? x ? 90 C. 80 ? x < 120 D. Impossible to get a B.