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1.When Professor Sum was asked...

1.When Professor Sum was asked by Mr. Little how many students were in his classes, he answered, “All of them study either languages, physics, or not at all. One-half of them study languages only, one-fourth of them study French, one-seventh of them study physics only, and 20 do not study at all.” How many students does Professor Sum have?

2.A student claims that the equation, the square root of(-x) = 3 has no solution, since the square root of a negative number does not exist. Why is this argument wrong?

28. The effect of depreciation can be computed using a formula similar to the formula for compound interest.

a. Assume depreciation is the same each month. Write a problem involving depreciation and solve it.

b. Develop a general formula for depreciation defining what each variable in the formula stands for.

38. List three real-world situations that involve ratio and proportion.

37. Write a paragraph in which you use the terms ratio and proportion correctly.

2.A student claims that the equation, the square root of(-x) = 3 has no solution, since the square root of a negative number does not exist. Why is this argument wrong?

28. The effect of depreciation can be computed using a formula similar to the formula for compound interest.

a. Assume depreciation is the same each month. Write a problem involving depreciation and solve it.

b. Develop a general formula for depreciation defining what each variable in the formula stands for.

38. List three real-world situations that involve ratio and proportion.

37. Write a paragraph in which you use the terms ratio and proportion correctly.

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