Can some help me 13-16 please I don’t know what to do it’s urgent

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Find the values of y: 3y^3(y^2+ 2/3y)=0

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling