In a school with 400 students 22% of them are 6th grade how many students are in 6th grade

You’re repairing a large rectangular aquarium. the final step is to cover the glass with a protective film. the front and back of the aquarium measure 4 meters by 2 meters, and the sides of the aquarium measure 3 meters by 2 meters. how many square meters of protective film do you need? ( )

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)