Help please. I cant afford to get this wrong

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

What ia the sum if the first 7 terms of the geometric series

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