5x+5y+2z=1
x+3y+7z=-12
5x-7y-3z=-52

solve using a matrix with caramers rule

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?

Graph the equation 8x - 4y = 56. then, trace the graph to find the missing value in the coordinate pairs below: (-10, 140 ) (0, ) (2, ) (4, ) ( , 0)