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Volume of cone= 1/3Pihr^2 r=2.25  V=1/3Pi102.25^2=53.01 cm^3=5.301x10&-5 m^3 Mass=density*volume Mass=(5.301x10^-5)1095= 0.05805 kg Mass of 5= 0.058055=0.290 kg

Multiply everything through by e^x   and rearrange so it equals zero
you now have e^2x -e^x-6=0
It is now similar to a quadratic equation, make the dummy substitu...

In order to solve this trickier problem, the quadratic equation must be applied 
x=[-b +- sqrt(b^2-4ac)]/2a

Apologies for messy notation, full solution will be demonstrated during inter...

A parabola shape with x intercepts at x = -3 and x = 7 and the y intercept at y = -21

Factorise to get (x+3)(x-7)=0 
So you can see that x = -3 or x =7