Which expression is equivalent to the given expression​

I need help ASAP!

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

The area of a circle is equal to 1 dm². find the radius of the circle.

Will make ! for correct answer the dot plot below shows the number of toys 21 shops sold in an hour.is the median or the mean a better center for this data and why? a. median; because the data is not symmetric and there are outliersb. median; because the data is symmetric and there are no outliersc. mean; because the data is symmetric and there are no outliersd. mean; because the data is skewed and there are outliers