Which of the following expressions is equal to x² + 36? * (x - 6i)²
(x + 6i)²
(x + 9i)(x - 4i)
(x + 6i)(x - 6i)

I’m stuck on this i don’t understand.

Which speed is the fastest (use 1 mile ≈ 1.6 kilometers)? a. 12 miles/hour b. 18 feet/second c. 19 kilometers/hour d. cannot be determined

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?