given
f(x)=x^3-10x^2+9x
for x = 0, f(x) = 0
means the curve must pass through 0.
for x = 1, f(x) = 0
for x = 9, f(x) = 0
f(x)=x^3-10x^2+9x = x( x^2 - 10x + 9)
= x(x^2 - 9x - x - 9)
= x(x-9)(x-1)
Therefore 2nd curve is correct.
The answer is in the image
y=2x+15
where y=Value of coin
x=Age in years
Value of coin after 19 years=2*19+15
=$53
Therefore, Value after 19 years=$53
The solution is given in the image below
The wood before starting =12 feet
Left wood=6 feet
Wood used till now=12-6=6 feet
Picture frame built till now= 6/(3/4)
=8 pieces
Therefore, till now 8 pieces have been made.
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