Help neeed it right if not ill get beat

Describe all the numbers that when rounded to the nearest thousand are 645,000

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)