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## Robert A.'s Resources

-3xy/6xy is [ (-3xy) / 6] • xy which equals (-1/2)x2y2  not -1/2 and not -2.   So the answer is: ( 48x7y6 ) - ( ( 1/2 ) x2y2 )   PEMDAS   And you perform the M and D in order left to right then the A and S in order left to right. You do not perform all...

Do you mean: ( 3a2x -6ax2 +24a2x2 ) / ( 12a2x2 )   The way you wrote it is: (3a2x) - (6ax2) + ( [ (24a2x2) / 12 ] • a2x2 )   Mathematics is a language; and just like in English, you need to get the subjects, verbs, adjectives, and commas in the right place...

So why did you post the same thing twice in 25 minutes????? That's a no-no on bulletin boards.   This is a physics problem. But if you want to solve it like it was a math problem - okay.   1st you can find the x-axis of symmetry.  x= -b/2aThen you can find ...

For a polynomial of form  Ax^2 + Bx + C = 0 A tells the end behavior.  Negative says it opens down, the end behavior is down on both left and right. The axis of symmetry is given by x = -b/2a Find -b/2a, that is the ex value for the vertex. Plug that value into...

If you look at the sides you can see that they are in a ratio of 3,4,5. This is a 3,4,5 triangle - one of the special triangles that never gets put in the book with the 45-45-90 and 30-60-90. So you can see this is a right triangle with the long (10) side as the hypotenuse. Draw a picture...

Evidence is at the bottom after explanation.   The green color of leaves is from the chlorophyll in the leaves. BUT - chlorophyll is Not Green.  There are two colors of chlorophyll; red and blue. The mixture of these two colors being absorbed makes the leaves 'look'...

For f(6)  it means you plug 6 into the equation for x and evaluate it.   Like this: f(x) = 8x - 2        = 8(6) - 2        = 48 - 2   =  46   Do the rest by putting in 1.5, 0, a,...

7x + 9y - 7 = -9   move all but 'y' to the right side 9y = -7x +7 - 9      = -7x -2   divide by 9 y = -7x/9 -2/9    = (-7/9)x -2/9   so compare to y = mx +b and you can find the slope and interc...

d/dx(x^(1/x))   Express x^(1/x) as a power of e      x^(1/x) = e^(log(x^(1/x))) = e^((log(x))/x)      = d/dx(e^((log(x))/x)) Using the chain rule     d/dx(e^((log(x))/x)) = ( de^u)/( du) ( du)/( dx)   ...

d/dx (log(4) x e^x) Factor out constants:      = log(4) (d/dx(e^x x)) Use the product rule,      d/dx(u v) = v ( du)/( dx) + u ( dv)/( dx),      where u = e^x and v = x:      =...

You have a quadratic in the form of: y = (x-h)^2 + k   1) The vertex is (h,k) or (2,-1) 2) The axis of symmetry is x=h  (or x=2) 3) The a=1/2 widens the parabola and is + so the graph opens up The h = +2 shifts the parabola 2 to the right of the y axis The...

Write two equations.   the difference of the two numbers is 17 X - Y = 17   the larger is twice the smaller decreased by 13 X = 2 ·Y - 13   Now solve the simultaneous equations by any method, substitution or by elimination.

But they are not in alphabetical order. CAT - 60 BEAR = 180 sorry but Bear should come before Cat, it is ABC not ACB.

The bank is 1/3 full - that is the same as 2/6 full. When she added 440 pennies if went from 2/6 full to 5/6 full. 5/6 - 2/6 = 3/6 increase for the 440 pennies.   There are 2 ways to think of it from here: 1) 440 pennies was 3/6 of the bank so dividing by 3    ...

How many dice??   If you roll 1 die there are 5 possibilities. If you roll 2 there are 5x5 posibilities Roll 3 and there are 5x5x5 possibilities.

For a parabola in the form y = A(x-h)2 + k  the vertex is (h,k)SO   1) Rewrite the equation in that form. OR Using the x axis of symmetry is -(b/2a)   find x then substitute that into the equation   to get the y value.   x = -(b/2a)...

The tax is 9% of \$65.40 The tip is 20% of \$65.40 - a very generous tip btw.   Tax = 0.09(65.40) = ? Tip = 0.20(65.40) = ?   For the total add up 65.40 plus the tax plus the tip.   I am going to assume you can do the arithmetic on your own.   This...

If this is a thermal chemistry or physics problem there are some things you might be expected to know. If this is a mathematics (pre-calc) problem then you need to know if the change in temperatures is a linear relationship or not, and if not what king of relationship.   In either...

You gave the method to the solution in your question. Solve by substituting y=3x+4  INTO 7x+2y=21   7x+2y=21 becomes 7x+2(3x+4)=21 distribute 7x+6x+8=21 now solve for x