Question 499417


{{{f(x)=-0.001218x^4+0.082326x^3-1.3267x^2+12.46x+4.914}}} Start with the given equation.



{{{f(2.5)=-0.001218(2.5)^4+0.082326(2.5)^3-1.3267(2.5)^2+12.46(2.5)+4.914}}} Plug in {{{x=2.5}}} (basically, replace ALL copies of x with 2.5).



{{{f(2.5)=-0.001218(39.0625)+0.082326(2.5)^3-1.3267(2.5)^2+12.46(2.5)+4.914}}} Raise  {{{2.5}}} to the 4th power to get {{{39.0625}}}.



{{{f(2.5)=-0.001218(39.0625)+0.082326(15.625)-1.3267(2.5)^2+12.46(2.5)+4.914}}} Cube {{{2.5}}} to get {{{15.625}}}.



{{{f(2.5)=-0.001218(39.0625)+0.082326(15.625)-1.3267(6.25)+12.46(2.5)+4.914}}} Square {{{2.5}}} to get {{{6.25}}}.



{{{f(2.5)=-0.047578125+0.082326(15.625)-1.3267(6.25)+12.46(2.5)+4.914}}} Multiply {{{-0.001218}}} and {{{39.0625}}} to get {{{-0.047578125}}}.



{{{f(2.5)=-0.047578125+1.28634375-1.3267(6.25)+12.46(2.5)+4.914}}} Multiply {{{0.082326}}} and {{{15.625}}} to get {{{1.28634375}}}.



{{{f(2.5)=-0.047578125+1.28634375-8.291875+12.46(2.5)+4.914}}} Multiply {{{-1.3267}}} and {{{6.25}}} to get {{{-8.291875}}}.



{{{f(2.5)=-0.047578125+1.28634375-8.291875+31.15+4.914}}} Multiply {{{12.46}}} and {{{2.5}}} to get {{{31.15}}}.



{{{f(2.5)=29.010890625}}} Combine like terms.



So the 2.5 yr old unicorn is roughly 29.010890625 years old in human years.



I'll let you do the other part. Let me know if you still need help.