Please Help me: I am taking Praxis II and I need some help with a few math problems (mid-level)?
I am sure that these are simple enough, but I want to make sure that I understand these. I took a practice test and I thought that I had done fairly well on it, but I missed 8 out of 30! I have a lot riding on this test, I have one chance to take it before the fall and if I do not pass, it will delay my graduation for one year. I feel really dumb, I have A's in all of my math classes, but this test seems to be hard for me. I will think that I have a grasp on it, but I have already failed it once. All help is appreciated and please make sure to explain your answer. Thank you!
1.) The population of country X is 0.36 billion persons, and the population of country Z is 12 million persons. The population of country X is how many times that of country Z?
2.) The 40 eggs in a box weight a total of x pounds. What is the average weight per egg for the eggs in the box, in ounces? a) x/640 b)56/x c)56x d)2x/5
3.) Shows a right triangle: side a=x side b=4 side c=w
What is x^2 in terms of w?
4.) Shows a graph with a line segment with the coordinates a(1,1) and b(4,4)
If line segment AB is flipped over the x-axis such that point A becomes point C and point B becomes point D. What are the coordinates for C and D?
4.) It shows three circles with one triable that goes through all three of them and they are arranged in such a way that the sides of the triangle makes up the radius of each circle. The problem reads:
Each circle is tangent to the other two circles. The points X, Y , and Z are the centers of the circles. If the circles have radii of 3, 4, and 5, respectively, what is the perimeter of triangle XYZ?
What would happen to the value of P in the equation above if the value of X was increased by 10% and the value of Y was decreased y 10%?
6.) A 4-inch by 6-inch photograph is to be enlarged by proportionally so that the 4-inch side expands to 5 inches. What would be the new length, in inches, of the 6-inch side of the photograph?
7.) A set consists of the letters A,B,C,D,E, and F. If order is not important, how many two-letter subsets are possible?
I know this is a lot of questions, but I really need help to make sure that I understand how to work them. I really do appreciate your time and help. Thank you in advance.