solving a 2x2 system of linear equations that is inconsistent or consistent dependent "-x+2y=4," x-2y=-4

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

[15 points]find the quotient with the restrictions. (x^2 - 2x - 3) (x^2 + 4x + 3) ÷ (x^2 + 2x - 8) (x^2 + 6x + 8)

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