What are the solutions to the equation? 7x^3=28x

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Two trains leave stations 546 miles apart at the same time and travel toward each other. one train travels at 95 miles per hour while the other travels at 115 miles per hour l. how long will it take for the two trains to meet

∠1 and ∠2 are vertical angles. ∠2 has a measure of 63°. what is the measure of ∠1 ? enter your answer in the box.

Is a triangle with sides of length 6ft, 21 ft, 23 ft. a right triangle?