exam Maths Puzzle Numerical Ability

A theater has 30 rows of seat, the first row has 10 seats and each row thereafter has 1 more seat than the previous row. How many seat are in the theater and what is the equation?

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Find the surface area of a prism with height of 4 m when its base is an equilateral triangle with sides of 6 m. I am trying to help my daughter with homework. Since it has been many years I have forgotten how to do. How to i anwer this ...Seperate $89 into two parts so that the second part is $4less than twice the first part.