Does anybody know what this is?

6.9 + (-5) + 4.1=

I tried working it out several times but every time I do I ... I get a different answer!

What is the focus of the parabola given by the equation y = x2 - 2x - 3?

1. The sum of three consecutive odd numbers is 243. Find the largest of the three numbers.

What expression is equivalent to (5z^2+3z+2) ^2

Find the solution (s) to the system of equations represented in the graph. They intersect at 0, negative 4 and 4, 0 (0, 4) and (4, 0) (0, 4) and (-4, 0) (0, - 4) and (4, 0) (0, - 4) and (-4, 0)

The senior classes at High School A and High school B planned separate trips to Yellowstone National Park. The senior class at high School A rested and filled 14 vans and 2 buses with 296 students.

Craig randomly surveys 50 people to find their favorite store at the mall. He finds that 18 people say they like the clothing store the best.

Factor x 2 + xy - 2x - 2y. (x + 2) (x - y) (x + y) (x - 2) (x - y) (x + 2)

Estimate the product of 28.21 times 8.02

How many laps around the track equals a mile?

Solve for y y - 12 = - 10