Venn diagrams: unions, intersections, and complements

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What value of x is in the solution set of –5x – 15 > 10 + 20x?

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip