Helicopter speed increases from 30 m/s to 40 m/s in five seconds what is the acceleration of this helicopter

What could explain what happened when the time was equal to 120 minutes

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex