Could you check my answer, whether i done it right or wrong? if there was some mistakes in my calculation/answers, would you mind explain why? (+information= rst is a straight line)

Solve the system. -a+4b+2c=-8 3a+b-4c=9 b=-1 a.(0,11) ,-1,2) c.(1,1,-2) d.(2,-1,-1)

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?