If i miss 8 questions out of 58 what is my grade

Which statement justifies why angle ebc measures 90?

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?