Solve the equation

3,8x - 9.2 = 7.4 + 1,4x

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

Can someone me do math because i am having a breakdown rn because i don’t get it

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section