Solve the system of equations. 2x + 2y+ 3z = 9
2x + y + 5z = 7
5x + 2y + 4z = 9

Pls help!!

The test scores of 32 students are listed below. construct a boxplot for the data set and include the values of the 5-number summary. 32 37 41 44 46 48 53 55 57 57 59 63 65 66 68 69 70 71 74 74 75 77 78 79 81 82 83 86 89 92 95 99

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1