What does "help flatten the curve" mean when the Corona Virus is talked about. In your own words explain what it means in terms of math

What is the upper quartile in the box plot?

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position