(PLEASE HELP ME) Solve the system of linear equation using substitution method. SHOW YOUR SOLUTION AND THE CHECKING
1.) x+3y =11
2x+y =7
2.) x+y =9
5x+4y =47

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

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).