Evaluate xy^2 divided by 5y if x=10 and y=2

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.

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c