Simplify (9^6/9^5)^2

Describe what moves you could use to create the transformation of the original image shown at right

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax