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Is this supposed to be a joke? Or do you actually not know what math is?

We'll work as follows.

×89×5718

=×189×57181

Canceling the common factor 

8

=563

Multiplying the numerators;
Multiplying the denominators

Here is the answer.
 

563

The answer is x=3.

In answer # 2, I didn't realize you wanted annual percentage rate:

1 - .958112 =0.041888 x 100 =4.19% annual percentage discount.

2x+6=12

2x+6=12

    -6   -6

2x=6

2x/2x=6/2x

                              x=3

If two figures are similar, then the ratio of their areas is proportional to the squares of their corresponding sides.

Formula:  (side₁)² / (side₂)²  =  Area₁ / Area₂

--->     (4)² / (8)²  =  18 / A     --->     16 / 64  =  18 / A

--->     16·A  =  18·64             (cross-multiplying)

--->     16·A  =  1152

--->          A  =  72

ratio language is to describe the relationship between two quantities

cos^-1(x)  is used to find the angle whose cosine has a value of x.

Cos values are no smaller than -1 nor are they any larger than + 1; thus x must be in the range from -1 to +1 (inclusive).

Therefore cos^-1(90) is undefined.

Did you mean to find the cos(90)? This would be possible.

5000/9500=0.526316 total discount over 15 years

.526316^(1/15)=0.958112 discount per year, so that:

.958112^15 x 9,500 =$5,000.00

If the area is 800 m², then l · w  =  800                                 (l = length; w = width)

If the perimeter is 120 m, the 2l + 2w  =  120

2l + 2w  =  120     --->     l + w  =  60                                     (divide both sides by 2)

l · w  =  800         --->     w  =  800 / l                                     (divide both sides by l)

Combining:  l + w  =  60     and     w  =  800 / l      --->     l + 800 / l  =  60

Multiplying both sides by l:     l² + 800  =  60l

Rearranging:                          l² - 60l + 800  =  0

Factoring:                              (l - 40)(l - 20)  =  0

Solving:                 either       l = 40     or  l = 20

If l = 40, then w = 20; if l = 20, then w = 40.

Either way, the dimensions are 20m by 40m.

5x +  7 = 3x - 5         | + 5

5x +13 = 3x              | / 3

(5/3)x + 13/3 = x       | - (5/3)x

13/3  = -(1/3)x          | *(- 3)

- 37/6  = x

If this is a perfectly shaped normal distribution, then the mean, median, and mode all have the same value; but if you don't know that it's perfectly shaped, knowing the mean and the standard deviation doesn't tell you either the value of the median or the mode.

You have two equations:

a*b = 800m^2

2*a + 2*b = 120m

now you combine them and you get:

a = 85;

b = 40

1997-2012 = 11 years

9500-5000 = 4500 $

11* 4500 = 49,500 *0,0001 = 4.95 %

Answer 4.95%

the square root of 4 is 2

85/1

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