III. State whether the following statement is true or false. 1. The literal coefficients of 5 - 6x + 7x2 are x and x2 2. The numerical coefficient of 70 is 0. 3. The coefficient in 90x is 90. 4. In 2x + 1, the only constant is 1. 5. In 3x – 18y, the variables are x and y.​