Please help find the percent of decrease?!
2 answers:
The easiest way to do do this is to first find out how much % 500 is of 700
first, we can just set it up as a simplified fraction
which is equal to..
then we divide 100 by this number
*now to check*
multiply the quotient by .01 to get .7142...
then multiply that by 700
we should get a product of 500, confirming our answer
now that we're sure, subtract 71 from 100 to find the percentage decrease
first, we can just set it up as a simplified fraction
which is equal to..
then we divide 100 by this number
*now to check*
multiply the quotient by .01 to get .7142...
then multiply that by 700
we should get a product of 500, confirming our answer
now that we're sure, subtract 71 from 100 to find the percentage decrease
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From the equation, it looks like we can set up a triangle like this. One side is x and the other is x + 20 because the northbound car traveled 20 miles farther. The hypotenuse is 100 because they were 100 miles apart.
Next, we can use the Pythagorean Theorem to solve for x:
a² + b² = c²
x² + (x + 20)² = 100²
This simplifies to:
x² + x² + 40x + 400 = 10000
2x² + 40x = 9600
2x² + 40x - 9600 = 0
After that, we can divided each side by 2:
x² + 20x - 4800 = 0
Next, we have to factor:
(x - 60)(x + 80) = 0
x = 60, -80
Since we know that distance can't be negative, 60 is the valid answer in this case.
x = 60
x + 20 = 80
Using this information, we know that the westbound car traveled 60 miles and the northbound car traveled 80 miles.
Next, we can use the Pythagorean Theorem to solve for x:
a² + b² = c²
x² + (x + 20)² = 100²
This simplifies to:
x² + x² + 40x + 400 = 10000
2x² + 40x = 9600
2x² + 40x - 9600 = 0
After that, we can divided each side by 2:
x² + 20x - 4800 = 0
Next, we have to factor:
(x - 60)(x + 80) = 0
x = 60, -80
Since we know that distance can't be negative, 60 is the valid answer in this case.
x = 60
x + 20 = 80
Using this information, we know that the westbound car traveled 60 miles and the northbound car traveled 80 miles.