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2+2=4 is addition Equation

Thanks!

that is not how you do it

f(x)  =  6  means that we want to sub 6 for f(x) and solve for x.....so we have

6  = 5x - 9      add 9 to both sides

15  =  5x       divide both sides by 5

3  = x

We multiply both members with 1.17 so :1.17 x/1.17=1.17 (-9.3) <=> x=1.17 (-9.3) =-10.881 so x=-10.881

x * y  = - 48      (1)

x + y  =  13  →  y = 13 - x     (2)

Sub  (2)  into (1)

x ( 13 - x)  =  -48

13x - x^2  = -48  rearrange as

x^2 - 13x - 48  = 0         factor

(x - 16) ( x + 3)   = 0         set each factor to 0  and solve for x

x - 16   = 0                                x + 3   = 0

add 16 to both sides                   subtract 3 from both sides

x =  16                                        x  =  -3

Using  (2) to  find y

y =  13 - 16  =  -3                    y  =  13 - (-3)   = 16

So......the two numbers  are  16  and -3

A more common and descriptive formula is:

FV = PV x [1 + R]^N, where FV=Future Value, PV=Present Value, R=Interest rate per period, N=Number of periods.

FV = 9,000 x [1 + 0.047]^5

FV = 9,000 x 1.047^5

FV = 9,000 x 1.258152857750007

FV = $11,323.38                                                                                                                                  

like mathematical equations second grade!

a1=12.12403840463596035 and

a2=-4.12403840463596035 at R

Α=7x+8y=14 

B=-7x-7y=-21

 Α+Β=...y=14-21 y=-7 so 

in A=7x+8(-7)=14<=>

<=>x=(14+56)/7<=>x=10 

x=10 and y=-7 

Solve the following system:
{7 x + 8 y = 14 | (equation 1)
-7 x - 7 y = -21 | (equation 2)
Add equation 1 to equation 2:
{7 x + 8 y = 14 | (equation 1)
0 x+y = -7 | (equation 2)
Subtract 8 × (equation 2) from equation 1:
{7 x+0 y = 70 | (equation 1)
0 x+y = -7 | (equation 2)
Divide equation 1 by 7:
{x+0 y = 10 | (equation 1)
0 x+y = -7 | (equation 2)
Collect results:
Answer: | x = 10          and           y = -7

Yes.  Enter log(a, b) to get the logarithm to the base b of a.

eg log(49,7) followed by Enter results in log₇(49) = 2

.

Ellen made a scale drawing of a swimming pool. She used the scale 2 inches = 1 foot. The diving board is 19 feet long in real life. How long is the diving board in the drawing?

The scale is: 2 inches =1 foot =12 inches, or:

1 inches = 6 inches

19 x 12 =228 inches - the length of the diving board.

228 / 6 =38 inches - length of the diving board on the drawing.

Area of semicircle: A1 = (1/2)*pi*4^2

Area of complete circle: A2 = pi*r^2

If A1 = A2 then pi *r^2 = (1/2)*pi*4^2

r^2 = (1/2)*16

r^2 = 8

r = sqrt(8)  or r = 2*sqrt(2) cm

.

4x - 7 > 29

Add 7 to both sides

4x > 36

Divide both sides by 4

x > 9

x usually represents the domain.

90 = (4*87 + 2*w)/6. where w is the average weight of the last two tortoises.

Rearrange:

w = (6*90 - 4*87)/2 

w = 96 pounds

.

x^2/3(8x)^1/3=2x 

(x+5)(x+5)+25=0

(x + 5)^2 + 25=0

Factor 4x^2-9=0

(2 x - 3) (2 x + 3) = 0

Solve for x:
sqrt(3 x - 2) - 4 = 0

Add 4 to both sides:
sqrt(3 x - 2) = 4

Raise both sides to the power of two:
3 x - 2 = 16

Add 2 to both sides:
3 x = 18

Divide both sides by 3:
Answer: | x = 6

posons r radius de semi circle 

et r' radius de complete circle

on a :   ( 2*r*pi ) / 2 = 2*r'*pi

             r*pi = 2*r'*pi

             r = 2r'

      d'ou r = 4 cm =2r'

     donc r' = 4/2 = 2

alors r' = 2