Write a matrix that represents the system of equations below: 7x-3y=21 and 5x-y=85

What are the soultion(s) to the quadratic equation 40- x^2=0

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)