300m because area is Length x width and it's 3x as big as 10 meters it's 30 x 10= 300
F(x) = 5.25x + 60
after 4 hrs..
f(4) = 5.25(4) + 60
f(4) = 21 + 60
f(4) = 81.......Rae would make $81 after 4 hrs
F(x) = 3x^3 -2x^2 - 19x -6
Y=x+5. add 5 to both sides