Kelly's new snowboard is 120% longer than her old snowboard. If the new snowboard is 150 cm, how long is her old snowboard?
1 answer:
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Answer:
450 m²
Step-by-step explanation:
Let x = length of rectangle and y = width of the rectangle.
Therefore,
2x + y = 60...............(1)
Making y subject of the formula, we have:
y = 60 - 2x............... (2)
We know area of a rectangle is length * width i.e A = x*y
Let's substitute (60-2x) for y,
A = x * (60-2x)
= 60x - 2(x)²
= -2x² + 60x
-4x + 60 = 0
-4x = -60
Let's substitute 15 for x in equation 2, we have:
y = 60 - 2(15)
= 60 - 30
y = 30
Since x = 15 & y = 30, the area would be:
A = xy
A = 15 * 30
A = 450 m²
The maximum area of the dog pen is 450m²
15)
m = Miguel Indurian titles amount l = Lance Armstrong titles amount
they both won titles to the tour de france, if we add all together, they sum up to 12 for both of them
so.. whatever "m" and "l" are, we could say that m + l = 12
now... Miguel won 2 fewer than Lance, so, whatever "l" is, m = l - 2
thus
solve for "l", to see how many Lance won
how many did Miguel win? well, m = l - 2
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17)
c = mgs amount in 12oz cup of regular coffee at starbucks
d = mgs amount in 12oz cup of regular decaffeinated coffee at starbucks
we know the regular coffee cup, has 13 times more than the decaf, same 12ouncer
thus whatever "c" and "d" are, we know that c = 13d
both 12ouncers put together, yield 280mgs of caffeine
so, one could say that whatever "c" and "d" are, c + d = 280
thus
solve for "d" to see how much is in the decaffed cup
the regular coffee cup? well c = 13d
m = Miguel Indurian titles amount l = Lance Armstrong titles amount
they both won titles to the tour de france, if we add all together, they sum up to 12 for both of them
so.. whatever "m" and "l" are, we could say that m + l = 12
now... Miguel won 2 fewer than Lance, so, whatever "l" is, m = l - 2
thus
solve for "l", to see how many Lance won
how many did Miguel win? well, m = l - 2
---------------------------------------------------------------------------------
17)
c = mgs amount in 12oz cup of regular coffee at starbucks
d = mgs amount in 12oz cup of regular decaffeinated coffee at starbucks
we know the regular coffee cup, has 13 times more than the decaf, same 12ouncer
thus whatever "c" and "d" are, we know that c = 13d
both 12ouncers put together, yield 280mgs of caffeine
so, one could say that whatever "c" and "d" are, c + d = 280
thus
solve for "d" to see how much is in the decaffed cup
the regular coffee cup? well c = 13d