9x+3y-4z=37 4x+3y+7z=16
X-5y+8z=-31
Blank 1 Blank 2 Blank 3 I need help solving this and filling in the blanks

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126