Figure 9. Screen 9 Review Variables Screen 9 (Figure 9) displays for your review all the variables you have selected. Check the variables to be sure they are correct. If the variables are all correct, press the key to receive spray instructions. (On some computer systems, the screen displays instructions telling you to press the key twice.) If any of the variables are incorrect, type the letter preceding that variable. (On some computer systems, the screen displays instructions telling you to press the key after typing the letter.) After you type a letter, the program redisplays the screen associated with that variable (Figures 2, 3, 4, 5, 6, or 7 and 8). After inputting the correct value, press and the program returns to the review screen (Figure 9). When all the values are correct, press for the spray instructions. This is a review of the variables you have entered: a. The height of the trees is 10 feet to 14 feet b. The spray tank will hold 250.00 gallons c. The pesticide is measured in pints d. The amount of pesticide per 500 gallons dilute is 1.75 e. The spray concentration is 6.0 X f. The oil rate is 1.0% If you wish to change a variable, type the corresponding letter, or just press for spray mixture instructions.