What is the measure of z? 3 27 у Z X z= pls help asap

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

What is the measure of angle x? answer