Nial and Alex have played table tennis against each other 30 times The ratio of the number of times Nial has won to the number of times Alex has won is 3:7 How many times has Alex won?

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

What ia the sum if the first 7 terms of the geometric series