using c++

2. Given the following names, identify which one is constant and what type of constant and which one can be used as a variable. If it is neither a valid variable name or a constant, then click on Invalid box (10 points) Item Valid Variable Constant Type of Constant Invalid _payRate '% A+B -3.25e-8 2xy True False sqrt(x) 4,000 Cin 3. Give valid C++ statement for each of the following (make sure to put semicolon to the end if you need that, your statement should be accurate one). (2x 5 = 10 points) a) Declare and initialize a variable called year to store the current year (2021) b) Write an assignment statement to compute the following expression. Vx+5 ph = 2x-3 Assume that x is already declared as float and its value is also provided. You need to declare phi and then write the expression to find the value of phi