Wednesday
December 4, 2013

Posts by willie

Total # Posts: 80

Math: Linear Equations
However, if the equation was this instead ... 2y + 16x = 0 ... then you do have a diagonal line that has both an x-intercept and a y-intercept and a slope that is not zero but not undefined. I think it is a negative slope. Can you figure out the x-intercept of the line? the y-...

Math: Linear Equations
I think these are trick questions and you have the right idea. 3x = 9 is the equation of a vertical line. There is no y in the equation, so there is no "y = mx + b" form for a vertical line. The simplest way to express this line is x = 3. Its x-intercept is 3 (becaus...

GEOMETRY
Use the inverse cosine feature of your calculator. It might look like cos with a little raised -1 next to it. invcos (9/20) = ??? Your answer will be in degrees or radians depending on your calculator setting. Try invcos (1/2). If it gives you 60 then your calculator is giving...

algebra
y varies inversely with x means that y = 1/x times some constant k. So, y = k/x is the general form of an equation of variation where y varies inversely as x. But now you also know that for a specific value x = 6, y = 1. Plug those values in to your equation to get something t...

trig (pre-cal class)
If you use a calculator with an inverse sine function, you can enter sin^-1 (0.1) = and find out what the acute angle value is. Then you can use that and plug it into the cos, tan, cot, csc, and sec functions of your calculator. If you don't have a calculator, use this fac...

Algebra I
Let n = number of nickels. Let d = number of dimes. Let q = number of quaraters. n + d + q = ____ 5n + 10d + 25q = 450 (Why?) d = n + 7 (Why?) Rewrite the first to equations but use (n + 7) everywhere you see d. n + (n + 7) + q = ??? 5n + 10(n + 7) + 25q = 450 You have 2 equat...

Math
An arithmetic sequence is one in which the differences between neighboring numbers is the same. The only arithmetic sequences you can get from that set of 5 numbers are: (1, 2, 3), (2, 3, 4), (3, 4, 5), or (1, 3, 5). So only 4 choices. How many ways can you arrange 3 numbers f...

chemistry
what is the substance in a solution that gets dissolved

Chemistry
300 ml of a 0.5NKOH solution, how can it be neutralized

chemistry
the molarity of a solution containing 40 grams of NaOH in 100 ml of solution is

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