What number would 16000 be when rounded to the nearest thousand

Neveah and clint are baking muffins for the bake sale. they need to bake 30 muffins for their display case. clint has baked 4 so far, and neveah has baked 7. how many muffins (m) do they have left to bake? show your work!

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'