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You can run 4 laps in 10 minutes your friend can run 6 laps in 15 minutes. are these rates proportional

6.3x+14 and 1.5x-6 answer in simplified form

After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? check all that apply. a. 9% + 3x2 = 14 + x-1 b. -x+ + 4x + 7 = -32-9 c. 5x + 4 = 3x4 - 2 d. 2x2 + x2 + x = 30