Please help!! 20 points
1 answer:
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First, rewrite the numerator in such a way that the coefficient 2.1 becomes 21:
Divide the coefficient:
Divide the base by subtracting the exponents of the base 10.
Hence, the quotient of the given expression has a coefficient of 3 and the exponent of the base 10 is -4.
Let side be "a" cm. So another side is (30-2a)/2=15-a
S=ab=a(15-a)=15a-a^2 - parabola
maximum when a = -15/-2=7.5 cm
When a=7.5 all sides are 7.5 cm
So it's a square. S=a*a=7.5*7.5=56.25 cm^2 - max
There is no global minimun for S.(look at the graphic)
S=ab=a(15-a)=15a-a^2 - parabola
maximum when a = -15/-2=7.5 cm
When a=7.5 all sides are 7.5 cm
So it's a square. S=a*a=7.5*7.5=56.25 cm^2 - max
There is no global minimun for S.(look at the graphic)