Please help with these five problems, it's all solving systems by the elimination method. 2x + 3y = -12
-x - 3y = 18
x=
y=

7x - 5y = -24
-9x + 5y = 18
x=
y=

2x - 3y = -9
-2x + 3y = 18
x=
y=

2x + 10y = 54
-7x - 10y = -89
x=
y=

5x -4y = -23
-5x + 9y =8
x=
y=

Find the value of the cosine for angle a

Aswimming pool is a rectangle with semicircles on the end. the rectangle is 12 meters wide and 30 meters long. the diameter and width of the swimming pool are equal. sketch and label an overhead diagram of the swimming pool. find the area of the swimming pool floor.

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.