Why cant a graphing calculator be used to solve approximate solutions to all polynomial equations

Part of the total score for each program is the sum of five program component scores. on the free program, the sum of these five program component scores is multiplied by a factor of 2.0. yuzuru hanyu, of japan, earned scores of 9.07, 8.96, 8.89, 9.21, and 9.36 for the program components portion of his free program. how many total points did he receive for this portion?

How many solutions does the nonlinear system of equations graphed below have?

Plz hurry evaluate the expression a+b where a=8 and b=19