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321-87 = 234

f(-4)=-x^2-3x+1

substitution

-4^2-3*-4+1=f

(Applying order of operations)

Simplify the exponent first

16-3*-4+1=f

Then multiplication

16+12+1=f

Finally, addition

29=f

Ask me if you have any questions!!!

It looks like you want to find the inverse of f(x)...(not the "inverse derivative" )....this one is not easy.....

WolframAlpha gives the inverse as....

To evaluate f^-1(3).....we can evaluate   f(x) where y= 3  

So

4 = 6 - (x^2)

subtract

4 - 6 = -(x^2)

simplify

-2 = -(x^2)

divide by (-1)

2 = (x^2)

square root

sqrt(2) = sqrt(x^2)

simplify

$${\sqrt{}}$$$$\mathrm{\ }$$2 = x

then x = the square root of 2 or ~1.422....

What a disappointment, I thought at least we were going to be asked for the angles of the triangle.

9 plus 10 is simply 19.

An isosceles triangle where tho of the sides have the length 2x + 3, and the third side has the length 2x ?

The perimeter is 36 cm.

2(2x + 3) + 2x = 36      Solve the paranthesis:

4x + 6 + 2x = 36      Subtract (-) 6 from both sides:

4x + 2x = 30     Add the X'es together

...

...

Can you take over from here?

11/12 + (-23/28) =

11/12 - 23/28

When one subtracts (-) [ or adds (+) ] one fraction from another, one has to make common denominator (bottom).

Remember that the value of a fraction is retained when one multiply (*) or divide (:) the numerator (top) and the denominator (bottom) with the same number.

12 factorized is 2 * 2 * 3

28 factorized is 2 * 2 * 7 

We see that in order to get common denominator (bottom) one has to multiply the "12-fraction" by 7 and the "28-fraction" by 3:

$$\frac{11}{12}-\frac{23}{28}=
\frac{11*7}{12*7}-\frac{23*3}{28*3}=
\frac{77}{84}-\frac{69}{84}=\frac{8}{84}$$

Divide both the numerator and the denominator by 4:

8/84 = 2/21

How do you find your anonymous user post? If fact how do I find this post?

hey that joke was mine i hate when people do this to me 

thank you i have a after school the gives you specialized highschool math and I'm only a middle schooler I'm also not in honor class or pre honor

The first 3 digit positive integer that is divisible by 3 is 102 and the last one is 999....so we have

(999-102)/3 + 1  = 300  ....  3 digit numbers divisible by 3

But only 1/2 of these are even....so.....(1/2) of 300   = 150

We can help you do math Anonymous. We can make you better at math. But if your doing this as a troll comment then just ignore this completely.

Then, you're probably on the wrong website....!!!!

You put the fraction in parentheses. For example, if your fraction is $${\frac{{\mathtt{4}}}{{\mathtt{5}}}}$$, you would enter it like this, (4/5). Ask me if you have any questions!!!

Good job....silver27....!!!

There's nothing to resolve.....if we knew " m " we could graph it.....do you have that??

I was thinking of something complex when I realized it is just 13×19=247. Answer: 247 combinations.

Let x be the "10s" digit and y be the "1s" digit   and the value of the number is 10x + y

"The sum of the digits = 8"   implies   x + y = 8  which implies that y = 8 - x

"The value of the number is 2 less than 10 times the 10s digit" implies   10x + y + 2 = 11x

So...subbing in y = 8 - x into the second equation, we have

10x + (8 - x) + 2 = 11x   simplify

9x + 10 = 11x   subtract 9x from both sides

10 = 2x      so  x = 5      y = 8 - 5 = 3

So..the number is 53....!!!

Well, there are a variety of answers. If you want to simplify it it would be 71/80. If you want to convert it to a decimal, it is 0.8875. If you want the stupid answer, 355/400 is just 355/400. A normal number, the way it is.

Well, on many calculators there is no way, you just have to divide out the fraction. For example the fraction 3/4 = 3÷4=0.75. This makes it much easier to work with on a calculator.

2.7 million miles

I beleve this person wants the cross-product  ....(0, 11, 2) x (0, 5, 3)

This will form a vector that is perpendicular to both of these

To get the x coordinate, we have

(11* 3) - (2 * 5)  =  33 - 10 = 23

To get the y coordinate, we have

(2*0) - (0* 3)  = 0

To get the z coordinate, we have 

(0 * 5) - (11* 0)   = 0

So....our cross-product vector is  (23, 0, 0)

This makes sense......since both of the given vectors lie in the y-z plane......the vector perpendicular to both should just lie along the x axis....!!!

Here's a pic.....

There are actually a few answers to this troll questions. If we turn three into it's different whole number parts we get either 1+1+1 or 1+2. Now given that 1=2 and vice versa we can either keep 1 = 1 and get 3=3, or turn all 1's into 2's and get 2+2+2 = 6 or turn a few of those numbers into 2's and 1's and get either 4 or 5, for the second whole number parts equation we can either get 3 again, 4, or 2. So the answer set becomes [1,2,3,4,5,6].

Your Welcome.

2*2004-1=4007

That is your answer

Make sure to play around with the equation, 2*   -1=The blank number positive odd integer, to make sure you understand.