Solve the equation using the quadratic formula.(2x - 1)(x + 1) = 6
A. 
B. 
C. 
D. 
Answer: B
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Solve.x2 + y2 = 13x - y = 1
A. (3, 2), (-2, -3) B. (-3, -2), (-2, -3) C. (3, -2), (2, -3) D. (-3, 2), (-2, 3)
Let x represent one number and let y represent the other number. Use the given conditions to write a system of equations. Solve the system and find the numbers.The sum of two numbers is 20. If one number is subtracted from the other, their difference is 7. Find the numbers.
A. 12.5 and 7.5 B. 13.5 and 6.5 C. 14.5 and 5.5 D. 10.5 and 9.5
Solve. Express the result in scientific notation. If necessary, round the decimal factor to two decimal places.Approximately 9 × 103 employees of a certain company average $30,000 each year in salary. What is the total amount earned by all the employees of this company per year?
A. $2.7 × 109 B. $27 × 108 C. $27 × 109 D. $2.7 × 108
Simplify.-8 + 7(18) + 7
A. 125 B. -11 C. 24 D. -25