exam Maths Puzzle Numerical Ability

A Star emits radiation at 424nm; it would normally emit radiation at 430nm. What is its radial velocity and direction.

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exam Other Question

Please help.
An employee who produces x units per hour earns an hourly wage of y = 0.45x + 11 (in dollars). Find the hourly wage for an employee who produces 14 units per hour.
A) $17.30
B) $17.80
C) $17.00
D) $17.70 What point is in the feasible region of the system of inequalities:

4x=y<=8
2x=5y<=18
x=>0, y=>0

Thanks,