Question 15:
3x - 21 = 4x - 8
x = -13
Question 16:
7x - (5x - 1) = 2
7x -5x + 1 = 2
2x = 1
x =
3x - 21 = 4x - 8
x = -13
Question 16:
7x - (5x - 1) = 2
7x -5x + 1 = 2
2x = 1
x =
Is this true or false?
1 answer:
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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)