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20=-4u

you have to make both sides even, but get rid of the negitive 4

20+4=-4u+4

Since -4+4= 0, that leaves u alone

20+4=u or 24=u

To solve the equation, remember the basic step. Everything that has an answer as 0 will almost all the time be 0.

So, change $$z$$ into 0.

$$-15*z=0\Rightarrow-15*0=0$$

Multiply.

$$-15*0=0$$

Compare the answer to the equation's answer.

$$0=0$$

So, this makes the equation true.

So the answer is $$\boxed{z=0}$$.

First way: find the number of books on the shelves and the number of books on the tables and add those two                    answers together:   (7 shelves) x (12 books per shelf)  +  (4 tables)x (12 books per table)

                       =   7 x 12  +  4 x 12          =         84  +  48         =         132 books

Second way: since each shelf and each table holds the same number of books, add the number of shelves to                         the number of shelves to the number of tables and then multiply that answer by 12:

                     (7 shelves + 4 tables) x (12 books per location)          11  x  12          =          132 books 

to find median, just line them up in order! its easy

5,6,7,9,10,12,12

now, cross them out one by one like this

5,6,7,9,10,12,12

then

5,6,7,9,10,12,12

the one in the very middle is the meidian

you got it from here?

Find invcos(0.6283)

or (2nd) cos(0.6283)

Your answer should be slightly larger than 51°.

To solve the problem, change $$x$$ into 2.

$$5x-3=13-3x\Rightarrow5*2-3=13-3*2$$

Now, multiply from both sides.

$$5*2=10$$

$$3*2=6$$

Now,  combine the equation.

$$10-3=13-6$$

Now, subtract from both sides.

$$10-3=7$$

$$13-6=7$$

Now, compare both answers.

$$7=7$$

As we can see, the answer is correct.

So, the answer is $$\boxed{x=2}$$.

Hope that this helps!

The same as if Sally has a Ferrari and Jimmy has a doughnut.

8^n  =  2^k

Get the same base, turn  8  =  2³

Now, you can replace  8  with  2³  into the original formula:   ( 2³ ) ^ n  =  2 ^ k

If you have an exponent to an exponent, mutiply the exponents:  so,  ( 2³ ) ^ n  =  2 ^ (3n)

     2 ^ (3n)  =  2 ^ k             This will only be true if  3n  =  k

Since you want  n  over  k,  divide both sides by  k:  3n / k  =  k / k     --->  3n / k  =  1

Now, finish this by dividing both sides by 3     --->   n / k  =  1 / 3

Let x be the first number and x + 8 the second

So  x(x + 8) = 105    simplify and rearrange

x² + 8x - 105 - 0   factor

(x - 7) (x + 15)  = 0

Setting both factors to 0, we have that x = 7 or x = -15

So, if ix = 7,   x + 8 = 15

And if x = -15   x + 8 = -7

multiply before you subtract, so multiply 2 x =2  =  -4

Then subtract:   -4 - 2  =  -6

The scale factor is 1/5th.....

Note...... 8.5 x (1/5) = 1.70 .....   and..... 11 x (1/5) = 2.2

Ok. here comes the answer!

As you see, (10/1) is actually (10).

So, change all fractions into their numerator.

$$(95.1)*(10/1)*(1.25/1)*(2/1)=(95.1)*(10)*(1.25)*(2)$$

Now, multiply from left to right.

$$\left({\mathtt{95.5}}\right){\mathtt{\,\times\,}}\left({\mathtt{10}}\right) = {\mathtt{955}}$$

$$\left({\mathtt{1.25}}\right){\mathtt{\,\times\,}}\left({\mathtt{2}}\right) = {\frac{{\mathtt{5}}}{{\mathtt{2}}}} = {\mathtt{2.5}}$$

Now, multiply 2.5 by 955.

$$\left({\mathtt{955}}\right){\mathtt{\,\times\,}}\left({\mathtt{2.5}}\right) = {\frac{{\mathtt{4\,775}}}{{\mathtt{2}}}} = {\mathtt{2\,387.5}}$$

So, your answer is $$2,387.5$$.

Hope that this helps!

Remember that the "-" in this situation is really "-1"

So   -1 * -5  = +5  because the product of two "minuses"  = a  "positive"  

Deg means degrees, but in a short way to say it.

[5² - 6pi] = about 6.15

[5² / pi ] - 1  = about 6.96

I'm not sure if ths is what you need, or not........

Ok I understand so the - sign acts like the property we will distribute, and a -(-) is a positive, this was also something else that was making me stumble on this lesson. I cant find this theory in my Algebra book anywhere, thank you very much.

Remember, when we have a negative outside a parentheses, it changes all the signs of the numbers inside.

Thus.......distributing the negative across both terms........

-(4x - 5) = -4x -(-5)  =  -4x + 5

Thus, a negative distributed across another negative gives us a positive  !!!

Thank you very much sir,

How did the -5 turn to a +5 after the distribitive property step? is this a rule i have missed?

3n - 6 = 15     add 6 to both sides

3n = 21          divide both sides by 3

n = 7

Just subtract 2300 from both sides !!!

Let 2x - 1 be the second number   ....then x is the first number....so we have

(2x - 1)² + x² =  794         .... simplify....

4x² - 4x + 1 + x² = 794   rearrange and simplify

5x2 - 4x - 793 = 0     factor

(5x + 61)(x - 13) = 0   Since the integer is positive, x - 13 = 0 →   x = 13

So 2(13) - 1 = 25

So the integers are 13 and 25

We'll have to calculate how much will be paid over the course of those 17 years.

To do that, we'll first have to calculate how much each monthly payment is.