Greta mastered 40% of the math items on her first try. if she mastered 66 items, how many are there in all?

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

Aplot of land has been surveyed for a new housing development with borders ab, bc, dc, and da. the plot of land is a right trapezoid with a height of 60 feet and an opposite leg length of 65 feet

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.