exam Maths Puzzle Numerical Ability

A department store is planning to hire up to 24 temp. employees for a tent sale. Expierenced workers will be paid $20 per hour and inexperienced workers $15 per hour. The company c

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Hi could you help me figure out this word problem?

The electric current I in amperes of a circuit is given by the formula log base 2 of I=-t. Find the current when t is 3s.

Thanks for the help
A ship is heading due northwest at 15 mph in a river that flows east at 7 mph. What is the magnitude and direction of the ship's velocity relative to the Earth's surface?