What is x for Tan40=45/x

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

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

How many grams the dog will eat in 3 days?