Given f(x) = -7x^4 + 9x² – X – 10 determine the following characteristics:
Total number of solutions, possible # of real solutions, possible # of imaginary solutions

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