What is the value of the y-coordinate of the solution to the system of equations? x-2y=1
x+4y=7

A.1
B.3
C.-1
D.4

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2