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1. What is (-7)^5 in expanded form

2. Solve 2s^3 - 4r^2 if r = 1 and s = 5 (explain all steps)

3. How would you convince a fellow student that the number 0.57 is a rational number?

A rational number is a number that can be written as a fraction where numerator and denominator are both integers (and the denominator is not zero). Since 0.57 = 57/100, so the number 0.57 can be written as a fraction where the numerator (57) and denominator (100) are both integers.