What’s the vertex of y=0.8(x+3.5)^2+6.2 Please help

How to determine whether two known pairs of points are on the same line.

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?