Solve using “completing the square”, you! x^4-4x^2+2=0

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

Find the value of x for which the lines are parallel.