Answer: No, they are not equal
1 kilogram = 1000 grams
6 kilograms = 6*1000 = 6000 grams
so we see that 6 kilograms is larger than 600 grams
Put another way,
600 grams = 600/1000 = 0.6 kilograms
You need to multiply the amount of loaves by the weight of one loaf:

.
7.5 = 120 ounces.
You would have to replace f(x) with zero and use quadratic formula
f(x)=x^2-5x+5
0=x^2-5x+5
=(-b+-√b^2-4ac)/2a
=(5+-√25-4(1)(5))/2
=(5+-√5)/2
x=(5+√5)/2 or x=(5-√5)/2
Both x values are completely applicable in the equation.
Hope I helped :)
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Radius = diameter/2 = 8/2 = 4m
Area of a circle = pi x r^2 = pi x 4^2 = 16pi m^2 ( exact area) or 50.27 m^2
Circumference = pi x diameter = 8pi m ( exact) or 25.12 m