1. A number’s prime factors are 2, 5, 7, 13and 31. Which of the following must be a factor of the number?

2. 2.If a + b = 0, then |a| = |b|.
If a and b are real numbers, which of the following can be inferred from the statement above?

3. 3.A = {-10, -5, -3, -1, 0, 1, 3, 5, 10}
The elements of Set A, shown above, are multiplied by 2 to get Set B. Which of the following is true about Set B?

4. If matrix A has dimensions 2 by 7 and matrix B has dimensions 7 by 5, what are the dimensions of the product matrix BA?

5. What is the surface area of the cube inscribed in a sphere with the radius of 8?

6. The parametric equations x = cos(2t) + 1 and y = 3sin(t) + 2 correspond to a subset of the graph

7. $$$\frac{20cis(\frac{19π}{18})}{5cis(\frac{2π}{9})}$$$=

8.

9. If $$$\frac{3}{x}-\frac{4}{y}+\frac{2}{z}=33$$$，$$$\frac{2}{x}-\frac{8}{y}-\frac{1}{z}=-8$$$，$$$\frac{4}{x}-\frac{6}{y}-\frac{3}{z}=11$$$
Then $$$\frac{1}{x-y+z}=$$$

10. The slope of the line normal to the graph of $$$y=2ln(sec$$$ $$$x)$$$ at $$$x=\frac{π}{4}$$$ is