exam Maths Puzzle Numerical Ability

Statistics. Sam must have an average of 70 or more in his summer course to
obtain a grade of C. His first three test grades were 75, 63, and 68. how do I an inequality representing the score that Sam must get on the last test to get a C grade.

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Find the exact value of sin(-π/6).

Thank You An employee who produces x units per hour earns an hourly wage of y = 0.80x + 11 (in dollars). Find the hourly wage for an employee who produces 19 units per hour.