Please help me!
I need it for summer school

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

What are “like terms”? why can we only add like terms?

The square root of 9x plus 7 plus the square rot of 2x equall to 7