Find the perimeter of this semi-circle with radius, r = 45cm. Give your answer as an expression in terms of pi

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

What is the equation of a vertical line passing through the point (−5, −1)? y = −5 y = −1 x = −5 x = −1

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets, x, and the number of student tickets, y. find the solution and explain what it means. i'll you if you me