If f(x) = 4x + 12 is graphed on a coordinate plane, what is the y-intercept of the graph?

The appalachian trail is a hiking trail that passes through the appalachian mountains. three members of a teen hiking group hiked a section of the trail. the hikers stopped at a rest area and equally shared 3 4 gallon of water. how much water did each person get?

What is the area of mnp? 40 m2 60 m2 68 m2 127.5 m2

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18