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
5. Determine whether the relation is a function: from last name to age.
A: ?
6. A commuter has $75. Each day's commute costs $3.50. Write a function to represent the total amount the commuter has remaining after d days. What is the value of the function for an input of 5, and what does it represent?
A: ?
1 and 2 fine
3. Evaluate (2.0 x 10^-7)/(8.0 x 10^-9). Write the answer in scientific notation.
A: 0.25 x 10^2
but usually written
2.5 * 10^1
age is not a function of last name
R = 75 - 3.5 d
if d = 5
R = 75 - 17.5 = 57.5 dollars left in pocket