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thank you Omi67 and heureka !

\(\begin{array}{rcll} 4 \text{ people} \cdot 2.5\ h &=& \frac12\ \text{job} \quad & | \quad \cdot 2 \\ 10\text { people} \cdot x &=& \frac13\ \text{job} \quad & | \quad \cdot 3 \\ \end{array}\\ \)

\(2\cdot 4 \cdot 2.5 = 1 job = 3\cdot 10 \cdot x\\ x = \frac{2\cdot 4 \cdot 2.5}{3\cdot 10}\ h\\ x = \frac{20}{30} \ h\\ x = \frac23\ h \\ x = 40\ \text{minutes} \)​

Hallo Solveit, so you can make it:

i pastet the same photo excuse me heureka !

18%

1st. iteration:0.3183098869 3116115102 9133158227 1859818425 3271454241 5867324370 79998

2nd.iteration:0.3183098861 8379067153 7767526745 0287240689 2483588666 9511161849 04229

It is obvious that this formula converges very rapidly to 1/pi. While the 1st. iteration has only about 8 accurate digits, the 2nd. iteration has no less than 40 accurate digits of 1/pi. It is converging quartically, or order 4. That is, each iteration quadruples the accurate number of digits of 1/pi.

Ok, so I was off. now I just gotta figure out what I did wrong...

48 x (7/8) x .55  = $23.10

 sqrt [(5) / (x + 3)]  = 4 / [x + sqrt(4)]        

 sqrt [ (5) / (x + 3)]  = 4/ [x + 2]           square both sides

5  / [x + 3]  =   16/ [x^2 + 4x + 4]         cross-multiply

5 [ x^2 + 4x + 4 ]  = 16[x + 3]     simplify

5x^2 + 20x + 20  = 16x + 48 

5x^2 + 4x -28  =  0     factor

[5x  + 14] [ x - 2]  = 0     

Setting each factor to O  we have that x = -14/5   or x = 2

However.....x = -14/5  produces a negative quantity on the right hand side of the original equation, and we can never get a negative out of the left hand side......so.......the two sides would have unequal signs, so x = -14/5  is not a soluition

So.......x = 2   is the only solution.....

Solve for x:
sqrt(5) sqrt(1/(x+3)) = 4/(x+2)

Cross multiply:
sqrt(5) sqrt(1/(x+3)) (x+2) = 4

Divide both sides by sqrt(5):
sqrt(1/(x+3)) (x+2) = 4/sqrt(5)

Divide both sides by x+2:
sqrt(1/(x+3)) = 4/(sqrt(5) (x+2))

Raise both sides to the power of two:
1/(x+3) = 16/(5 (x+2)^2)

Take the reciprocal of both sides:
x+3 = 5/16 (x+2)^2

Expand out terms of the right hand side:
x+3 = (5 x^2)/16+(5 x)/4+5/4

Subtract (5 x^2)/16+(5 x)/4+5/4 from both sides:
-(5 x^2)/16-x/4+7/4 = 0

The left hand side factors into a product with four terms:
-1/16 ((x-2) (5 x+14)) = 0

Multiply both sides by -16:
(x-2) (5 x+14) = 0

Split into two equations:
x-2 = 0 or 5 x+14 = 0

Add 2 to both sides:
x = 2 or 5 x+14 = 0

Subtract 14 from both sides:
x = 2 or 5 x = -14

Divide both sides by 5:
x = 2 or x = -14/5

sqrt(5) sqrt(1/(x+3)) => sqrt(5) sqrt(1/(3-14/5))  =  5
4/(x+2) => 4/(2-14/5)  =  -5:
So this solution is incorrect

sqrt(5) sqrt(1/(x+3)) => sqrt(5) sqrt(1/(3+2))  =  1
4/(x+2) => 4/(2+2)  =  1:
So this solution is correct

The solution is:
Answer: | x = 2

That problem should be illegal...

I did not get that........

Whatcha wanna text about?

$19.80, I think... I didn't really look at it so sorry if it's wrong...

................

Solve for x:
k = 1/2 h (c-x)

k = 1/2 h (c-x) is equivalent to 1/2 h (c-x) = k:
1/2 h (c-x) = k

Divide both sides by h/2:
c-x = (2 k)/h

Subtract c from both sides:
-x = (2 k)/h-c

Multiply both sides by -1:
Answer: | x = c - (2k)/h

Question 7 (10 points)

Chad built a scale model of a statue. He built the model 7 inches tall to represent the actual height of 15 feet. Which equation below represents the relationship between the actual height (a), in feet, and the height of the model (m), in inches?

When m=7  a=15  and the two are directly proportional so

a=km

15=k*7

k=15/7

so

a=(15/7)*m

Since the scale is 7: 180 or 1: 25 5/7 inches, or 1 inch to 2 1/7 feet, your equation should reflect that.

Hi rarinstraw1195,

YES, you were on the great answerers list :)

And, it is great that you are helping one the forum ;)

If the number of magazine=M, then

1.75M=Number of literature books.

Reggie is going to make a scale model of a Tyrannosaurus rex dinosaur. Tyrannosaurus rex was 20 ft high. If you use a scale of 2 in. : 5 ft, how tall will the model be?

Since the ratio is 2:60 inches, therefore the model should be:

2/60 X 240=8 inches tall, or 8/12=2/3 foot tall.

it depends on how much percent of magazines there are

SORRY, SEE CORRECTED FORMULA ABOVE.

360/6=60 km per hour