Book Maths Puzzle Algebra

Solve the inequality, state the solution set using interval notation

1/2x^2 is greater than/or equal to 4-x

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Book Other Question

Where is the vertex of the graph of y = x^2 - 5 A cruise ship can sail @28 mph in calm water. Sailing with the gulf current the ship can sail 170 miles in the same amount of time that it can sail 110 miles against the gulf curre