Solve the system of equations using matrices. use gaussian elimination with back-substitution.    x + y + z      =      -5  x - y + 3z     =     -1  4x + y + z    =     -2 

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189

Drag each expression to the correct location on the solution. not all expressions will be used. consider the polynomial 8x + 2x2 - 20x - 5. factor by grouping to write the polynomial in factored form.

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