The quadratic equation is x^2-8x=-4 is rewritten in the form (x+p)^2=q what is the value of p

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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

Answer! if you don’t mind, can you explain