Degree of ionic character can be determined based on differences in electronegativity.
See here: http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Electronegativity-861.html
The smallest difference in your list of 4 would be between Nitorgen (N) and Oxygen (O), with a difference...

If your expression a-2 b-3 is the same as (a-2)(b-3), which is the same as (a-2) x (b-3):
(3-2)(-2-3) = (1)(-5) = -5 (negative 5)... do what is inside the parentheses first.

Another way to see why this is true: try dividing by a very small number. For example: 2/0.001 = 2000. Now make that denominator even smaller: 2/0.0001 = 20,000. And smaller: 2/0.0000001 = 20,000,000.
As you can probably tell by now, as the denominator...

Email Wyzant customer service - use their internal email, and clearly identify yourself and your account, and why you want a refund: http://www.wyzant.com/ContactUs.aspx (or find it under "Contact Us" under the Help menu, at the top right on the Wyzant
home page)

Order of (math) operations says do in this order: parentheses, multiply, divide, add, subtract.
So 6 - 1 x 0 + 2 / 2 = 6 - 0 + 1 (1x0 = 0, and 2/2 = 1) = 7

Also, to find out how many pounds = 128 grams, you can set up a ratio:
1 pound : 453.6 grams :: x pound : 128 grams. Same as 1/453.6 = x/128
Multiply both sides by 128: 128/453.6 = x
Do the division: x = 0.282 pounds, or just over 1/4 of a pound, or just over 4 ounces...

Get everything with x on the same side: 9 + 2x - x = x - x + 96 (subtract x from both sides)
Simplify/combine: 9 + x = 96
Isolate x on one side: x = 96 - 9 (subtract 9 from both sides)
Solve: x = 87

Same as for your other percentage questions: write the percentage number then move the decimal left by two places. 0.15% becomes 0.0015

Same as for your other percentage questions: write the percentage number then move the decimal left by two places. 500% becomes 5.00

Same as for your other percentage questions: write the percentage number then move the decimal left by two places. 500% becomes 5.00

To convert or express percentages as decimals: write the percentage (2.5), then divide by 100, which is the same as moving the decimal two places to the left, so 2.5% = 0.025.
If you have a whole number (for example, 25), then same idea: write the percentage (25) and realize that...

I'm reading that as "1/20 (one twentieth) of 1% (one percent)". If true, then...
1% = 0.01
1/20 of 1% = 0.01/20 (0.01 divided by 20) = 0.0005

x = 1/2 y = y/2; y/2+y = 3; 1.5y = 3; y = 2
x + 2 = 3; x = 3-2 = 1
Or
x+y = 3 or x = 3-y; (3-y) = 1/2 y = y/2; 3 = y/2 + y = 1.5y; y = 2
x+2 = 3; x = 1

If you solve for x by using 4x-3 = 3x+2 then x=5, and each of the lines HI and JI is 17. But without at least one more measurement (angle or side), I don't think there is any way to solve for any other side, including HL or JL. Anything to add?

Sorry... we cannot answer as written. What do the [[ ]] around x mean? Absolute value of x, as in |x|? Is [[x]]+2/2 actually (x+2)/2? Is x < 6, or x < 0? Help!

Set up a ratio: 200/1 = x/4.5 (x = actual distance in miles)
4.5 * 200 = x (multiply both sides by 4.5)
x = 900 miles. And that makes logical sense if you look at it: for every 200 miles you have 1" on the map. So for 4.5" you now have 900 miles...

OK, so you have an Isosoles triangle (2 equal sides), and maybe even an equilateral triangle (all 3 sides equal,), but we don't know that. Question: is the "one side" that is 28 also one of the x-sides? Or the 3rd side? And units of measurement don't
really matter...

I would go to the experts: in your area (NC), that would be UNC, Duke, Wake Forest, and likely several others. Look at the online course offerings and find contacts for "Special Education" (or similar) courses. The email/call them and get recommendations.
Also,...

(-xy)3 = -x3y3, and does NOT = -xy3, since each term inside the ( ) must be cubed.
An exponent raised to another exponent is multiplied by that other exponent, so (y3)4 = y3x4 = y12.
The exponents of the same terms are simply added: (x)(x4) = x5. ...

I think of it this way:
f(x) simply means "a function of x" = f(x) changes with changes in x. When we graph, usually f(x) = y, the vertical graph axis. So your problem is now y=3x+1
So input several values for x; try 0 (zero), +1, and -1:
y = 3(0)...