Solve the system. X1 3x3 : = 9 2x1 + 2x2 + 7x3 : %3D X2 + 4x3 = 3 Select the correct choice below and, if necessary, fill in the answer bo> O A. The unique solution of the system is ( D. (Type integers or simplified fractions.) O B. The system has infinitely many solutions. O C. The system has no solution.

Evaluate 1₁3x8 - 7 x³ + 7 x² dx. Round your answer to two decimal places. S²₁3x8 – 7 x³ + 7x² dx = [Number

The marginal revenue of the xth box of flash cards sold is 500e-0.002x dollars per box. Find the revenue generated by selling items 101 through 4,000. (Round your answer to the nearest cent.)

A sample of 150 married women determined that 127 are happy in their marriage. A sample of 150 married men determined that 76% are happy in their marriage.   If you plan to test if the percent of married women who are happy in their marriage is greater than the percent of married men who are happy in their marriage.   What is the p-value? Write to 4 decimal places.