Solve the math problem please

Find the multiplicative inverse of 8-12i

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

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?