exam Maths Puzzle Numerical Ability

Directions: Solve each equation if the domain is {-2, -1, 1, 3, 4}

20. y = 4 - 5x

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exam Other Question

3x squared,...evaluate this expression for 3 diffrent values of x <------How can I solve that? A ship must average 22 knots (nautical miles per hour) to make its 10-hour run on schedule. During the first four hours bad weather caused it to reduce speed to 16 knots. What should its average speed be for the rest of the trip to maintain its schedule?