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-2 1/4=r-4/5

\(-2\frac{1}{4}=r-\frac{4}{5} \)

\(r=\frac{4}{5}-\frac{9}{4}=\frac{4\times 4-9\times 5}{5\times 4} =-\frac{29}{20} \)

\(r=-1\frac{9}{20}= -1.45\)

  !

-9=3(4c+5)

-9=12c+15.  I -15

-24=12c. I /12

-2 = c

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I will assume you meant  (3/2) x = 39      Multiply both sides by 2/3

                                              x = (39)(2/3) = 26

-2 1/4  =  r - 4/5     add 4/5 to both sides

-2 1/4 + 4/5  = r         2 1/4 = 9/4

- 9/4 + 4/5 = r          get common denominator of 20

-45/20 + 16/20 = r     simplify

-29/20 = r

- 1 9/20 = r

It does not matter what letter is used as a variable as long as you are consistent,......replace ALL of the 'z's with 'x's.....result wil be the same....

Sorry! Write mathematics brackets !

Nice, asinus.......we agree  !!!!

3 min 45 sec = 225 sec

8min 30 sec  = 510 sec

If it takes  225 sec to make 3 sandwiches and 3 salads, it should only take  225//3 = 75 sec to make 1 sandwich and 1 salad 

So let x be the time [ in seconds]  to make 1 sandwhich and y  be the time [ in seconds]  to make 1 salad....and we have this  system

1x +  1y  = 75

6x +  8y  = 510      multiply the first equation by   − 6 and add it to  the second

2y  =  60    divide both sides by 2

y = 30  sec for a salad

And

1x+ 30  = 75 →     x  = 45  sec for a sandwich

It takes a cook 3 minutes 45 se to make 3 sandwiches x and 3 salads y.  it takes him 8 min 30 sec to make 6 sandwiches x and 8 salads y.  How long does it take to make each sandwich x ?

A 30 sec

B 35 sec

C 45 sec

D 60 sec

\(3x+3y=225sec\)   [ * 8

\(6x+8y=510sec\)   [ * 3

\(24x+24y=1800sec\)

\(18x+24y=1530sec\)

\(1800sec-24x=1530sec-18x\)

\(-6x=-270sec\) 

\(x=45sec\)

The cook needs to make a sandwich 45 sec.

   !

U can write 4 as 4/1 because 4/1 = 4

But since u got a mixed number with different dividents you have to get the same dividents.

The one from 4/5 is 5 and the one from 4/1 is 1.

SInce you have 4/1 you have to take both times 5 to get it to the same divident.

So 4/1 becomes 20/5.

20/5+ 4/5 is 24/5

24/5 is then 4.8

Other way around:

U take 4/5 and add it up to the 4

4/5= 0.8

4+ 0.8 = 4.8

what is 4/3x?

\( 4/3x =\frac{4}{3x}\)

or

\(4/3x=\frac{4}{3}x\)

This is not clearly fomulated.
Place staples.
Then there is what you mean.

\(4/(3x)=\frac{4}{3x} \)

or

\((4/3)x =\frac{4}{3}x \)

  !

18=6sin(x - 80)+12

18 = 6sin(x - 80) + 12.   I -12

6 = 6sin(x  - 80)        I /6

1 = sin(x - 80).         I  arcsin

arcsin(1) = x - 80

90  = x - 80     I +80

170° =  x

Turtles = cool

9

3^2 = 9

$18 / 9 =$2 Interest earned per month

$2 x 12 =$24 Interest earned for 1 year.

$24 / $400 = 0.06 x 100 =6% simple annual interest.

18=6sin(x-80)+12

18 = 6sin(x-80) + 12.   I -12

6 = 6sin(x-80)        I /6

1 = sin(x-80).         I. arcsin

arcsin(1) = x-80.  I +80

arcsin(1)+ 80 = x 

170 = x

arcsin= sin^(-1)

I WANT $100 FROM YOU!!!!!.

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No, it does not!!:

111,111,111^2 =12,345,678,987,654,321

(10*20) * 1/2 = ur answer

I can try to explain it. Just need to tell me what u didnt understood.

actually you lost me at | -b|

Thanks! i didn't really expect anyone to answer

So a line has the following formula:

ax+b

a is the slope and b is the point where x = 0.

The slope is -3/4

so its -3/4 * x + b

To get b we just put the point into the equation.

f(x) = -3/4 * x + b

-3 = -3/4 * -2 + b   I

-3 = 6/4 + b.   I -b I +3

-b = 18/4

b=-4.5

Oh wait i didnt read ur answers. 

Ayy another edit:

y= -3/4 * x - 4.5.  I +3

y+3 = -3/4 * x - 1.5

is equal to: 

y+3 = -3/4(x+2)

Im way to tired but jea no prob.

Provided the deferment period is interest free, then you have:

PV=P{[1 + R]^N - 1.[1 + R]^-N} R^-1=PV OF $1 PER PERIOD.

2,875 = P x {[1 + 0.2557/12]^(2*12) - 1 x [1 + 0.2557/12]^-(2*12) / (0.2557/12)}

2,875 = P x                                       18.63657

P =2,875 / 18.63657

P = $154.27 Evelyn monthly payment.