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easy way is to set it up as a proportion. For example 1/4 is what as a percent?

1/4 = P/100. What is P? If yoy don't see it right away, "cross multiply" to solve for P.

So, 4P = 100 => P = 25       Answer 25%

By definition 25% MEANS 25 per hundred which is of course 1/4 or 1 per four.

2^(w+5) - 2^w = 124∛2      factor

2^w (2^5 - 1)  = 124∛2

2^w (31)  = 124∛2     divide both sides by 31

2^w   = 4∛2

2^w =  2^2 * 2^(1/3) 

2^w  = 2^(2 + 1/3)      w  →  2 + 1/3  =  7 / 3

-3/4

since 250 cm = 2.5 m, 3 m is greater

7^(x+3) + 7^(x+4) = 2744     factor

7^(x+3) ( 1 + 7) = 2744

7^(x + 3) (8)  = 2744   divide both sides by 8

7^(x + 3)  = 343

7^(x + 3)  =  7^3      →  x  =  0

The 2011 life expectancy is Japan (82.7 years) is_____ percent greater than 2011 world average life expectancy (67.9 years).

82.7 / 67.9  -   1  ≈  .218 =  21.8 %  greater

The median age at first marriage of US women (26.1 years) is____ percent less than the median age at first marriage of US men (28.2 years).

1 -  26.1 / 28.2  ≈  .0745 =  7.45 %  less

The amount of wheat produced by China in 2009 (115 million metric tons) was_____ percent greater than the amount of wheat produced by India in 2007 (81 million metric tons).

115/81 - 1 ≈  .4198  =  41.98%  more

See previous post:

http://web2.0calc.com/questions/trig-calculator-problems

Karly biked 'x' miles

Dory biked   11 x           together they biked 156 miles

x + 11x  = 156 miles

12x = 156

x =13      these are Karly's miles

Dory biked 11 times this amaount     11 x 13 = 143 miles

512 = 2^9

512 = 8^3

f(X) = 7^x   then f(x+2) = 7^(x+2) = 7^x * 7^2  =7^x * 49

NOT CLEAR FROM YOUR QUESTION====> TWO SCENARIOS:

First version: You paid the $200 deductible which leaves 1280 - 200 = 1080     this represents the 20 percent that you paid and the insurance company paid the other 80%

1080/.2 = $ 5400 that you and the insurance company paid together   

The insurance paid 80% of this   .8(5400) = $ 4320

So total bills would be the $200 you paid PLUS the 5400 you share-paid = $5600/yr

Second version: Total bills $ 1280    you pay $ 200 which leaves  $ 1080 of which insurance pays 80%

1080 x (.8) = $864 paid by insurance

Ask her for it 

95 / 8 = 11.875

By having awesome math skills.

11.875

2n+3(5n-2)=2+15n

2n + 15n -6 = 2 + 15 n    subtract 15n from both sides

2n - 6 = 2        Add 6 to both sides

2n = 8

n = 4

gathering like terms

17n-6 = 2+15n=> 2n=8=>n=4

100% of normal would mean   100% x 90 = 90 inches     normal

200% of normal would be        200% x 90 = 180 inches    Double normal

100% ABOVE normal would be 90 PLUS 100% x 90 = 180 inches

200% ABOVE normal     would be  90 PLUS 180 inches = 270 inches !

Answer is 8.

f(g(x) = sqrt (7x+b). 

So when x=4 and "y" is 6, this means 6 = sqrt(4x7+b) = sqrt(28+b) => 28+b=36 because sqrt of 36 is 6. Not that hard, and no I'm not smartest person alive

Go to school

Combinatorics.  Answer is 88x87/2.   There are 88 choices for first, 87 left for 2nd slot and divide by two to eliminate the irrelevance of the order of two people.

That statemanet is false...here is why

say the average score is 'x'     then the scores go down 20%  to   0.8 x 

now the scores go up 30% from 0.8x to   1.04 x  

that shows that in two years scores went from

   1.0 x to 1.04 x     and increase of only .04 x  which correlates to only 4%  increase (not 10%)

False. Only up 4%. From 100 down to 80 up to 104.

3  x  2/3   =  3/1  x  2/3   = 2   (the 3's cancel out)