Are these triangles congruent, if yes, why?

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Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

What is the number 321,000,000 in scientific notation? also what is the number? ?

It takes jonas 7 1/4 minutes to run the mile. it takes mario 8 5/12 to run the mile. how much faster is jonas than mario? 5/6 minute 1 1/3 minutes 1 1/6 minutes 1 1/2 minutesi will give points and brainlest