X²-9x=36
minus 36 both sides
x²-9x-36=0
what 2 numbers multiply to -36 and add to -9
-12 and 3
(x-12)(x+3)=0
set to zero
x-12=0
x=12
x+3=0
x=-3
the number is either -3 or 12
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➷ Factors are values that the number can be divided by to produce an integer (whole number)
Simply test them out:
29/5 = 5.8
29/9 = 3.2
29/1 = 29
29/21 = 1.38....
As per the statement above, the only factor of 29 from this line is 1.
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Katie won't have more than 100 shells until the 7th day
The first one = 5 and the second one = -6
hope this helps
Remark
You have to stare at this for a moment before you catch on. When you fold the arc into a circle, 8pi becomes the circumference of the base circle.
Formula
C = 2*pi*r
C = 8pi
Solution
8pi = 2pi * r Divide both sides by 2pi
8pi / 2 pi = r
4 = r Answer