What is 375900 rounded to the nearest hundred thousand

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Aline passes through 3,7 and 6,9 what equation represents the line