URGENT PLEASE HELP!!!(C Programming)

1. [30 pts] Which of these variable names are valid in C? If they are invalid, explain why. Valid Invalid Reason number.2 3rd Year Factorial! cestper.ltem cost-per-item 2. [40 pts] Given these statements int x, y double a, b; What are the values of x, y, a, and b after all.of the following code has executed? Pay particular. attention to the data types of the variables for determining integer vs floating point operations. x 13; x- a 10; b-a - (x + y) / 2; [50 pts] Complete the following function by writing C statements that correspond to the description in each comment in the code. 3. #include int main) Il Declare a floating point variable to store a rectangle's width // Declare a floating point variable to store a rectangle's length II Declare a third floating point variable that will store the area of the rectangle. /l Prompt the user to enter a width for the rectangle. /l Get the user's input, and store it in your previously declared variable for width /l Prompt the user to enter a length for the rectangle. /l Get the user's input, and store it in your previously declared variable for length I/ Using an if statement, print out "Error: invalid side length" if either length or width are // less than or equal to 0. ll Else II Calculate the area of the rectangle as a product of length times width, and store the // result in your variable for storing the area // Print "The area of a rectangle with sideswidth> and is " to the screen. II Replace , , and with the value of the associate variables. /I All floating point values should be printed out with 1 decimal place of precision. return 0 [50 pts] Given integer variables minSpeed, maxSpeed, and currentSpeed (which have already been declared and initialized), write if...else statements to print a different string to the screen, based on the relationship between the variables, according to the table below. 4. When current Speed is...Print. "Invalid current speed" "You aren't even moving..." less than 0 equal to 0 greater than O but less than minSpeed_Too slowl Speed up!" greater than maxSpeed between min Speed and maxSpeed "Safe speed achieved. Good job, driver