Graph the parabola. Identify the vertex.
y=-5x^2
choose the correct graph below.

The table respent two linear functions the equation respented by the first tables is given

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?