What is the value of the discriminant for the quadratic equation 0 = x + 2 + x2?

Discriminant = b2 – 4ac

–9
–7
7
9

What is the maximum total area that 450cm of string can enclose if it is used to form perimeters of two adjoining rectangles as shown?

What is the lcm of 16 and 40 ? 24 and 40 ?

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