Guassian elimination

-×-5y+z=17
-5×-5y+5z=5
2x+5y-3z= -10

6n^2-7n-75=0 solve by quadratic formula

Which of the following graphs represents the function f(x) = 2^x

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.