The factorization of x2 + 3x - 4 is modeled with algebra tiles. What are the factors of x2 + 3x - 4?

A) (x + 4) and (x - 4)

B) (x + 3) and (x - 4)

C) (x + 4) and (x - 1)

D) (x + 3) and (x - 1)

A scientist has 350 mg of a radioactive material. The material will cut in half every month. After how many months will there be. 68mg left?

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Abby is infected by a certain fungal infection. When she goes to the doctor, the population fungus is 4 million. The doctor prescribes an anti-fungal that reduces the fungus population to of its size each 5 day.

Select two ratios that are equivalent to 4:18. Choose 2 answers: (Choice A) 1:3 (Choice B) 2:9 (Choice C) 18:4 (Choice D) 10:80 (Choice E) 8:36

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