#3 is the correct value, but it is not scientific notation.
The others are ok.
1. Simplify ((-2x^4y^7)/(x^5))^3. Assume all variables are nonzero.
A: (-8y^21)/(x^3)
2. Simplify 3x(5y + 4) - 2xy - 10x + 6x^2
A: 13xy + 2x + 6x^2 or 6x^2 + 13xy + 2x
3. Evaluate (2.0 x 10^-7)/(8.0 x 10^-9). Write the answer in scientific notation.
A: 0.25 x 10^2
4. Evlauate f(x) = 8 - 4x for f(0), f(1/2), and f(-2).
A: 8, 6, 16
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