When rewriting y=2x+1 in function notation, what do you replace with f (x)?

Eric drew a scale drawing of a country park. the scale he used was 1 inch = 2.5 yards. the picnic area is 80 yards wide in real life. how wide is the picnic area in the drawing ?

He concluded that a heavier object dropped from the same height as a lighter object will land

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.