A parabolic headlamp has a bulb placed at the focus. A cross-section of the parabola is 6 cm deep and 12 cm wide. Which is an equation of the cross-section?

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Can you me find the missing length. i attached an image.