67. State whether the following are valid identifiers or not. State the reason for invalid identifiers. newBalance 2ndNum firstNum gross pay netPay gpa Staxes A2 68. In a C++ program the following declarations were made: int a = 3, b = 5; c = 2 float x = 3.6, y = 1.2 double z 1.44 Find the values assigned to the variable, after each of the following assignment statements. Assume the same initial values declared above for each assignment statement. // find the value ofx // find the value ofa a) x=c*x+b/a b) a = (a * b)/(a + b) c) c=b/a*c d) y b/4+x+ a e) a=++b f) a=o-c) g) b++ h) -c i) y = b % c + sqrt(10"2 // find the value c l find the valuc of y // find value of a and b // find value of a, b, and c // find the value ofb a = abs(y-x) + pow (a,c) a*-b y=int (x + y + c) Il value ofc // value of the expression and y // value of the expression and a /l value of a, and b //value of y k) l) 69. Write C++ statements for the following a (r"-1) V( a2 + b2 ) a, c= pmt =