If good at geometry.

first you need to dind the top angle

23°+36°=59°

as we know the sum of angles in a ️ is 180°

so we can find the angke next to y

180°-(59+54)=67°

the sum of this angle and y is 180° so we can find y

y=180°-67°=113°

or if you want a short way you can say that y= to the sum of the 2 other angles of the triangle which are on the other side of the angle next to y.

the answer is 18 units because there are 18 small cubes inside the rectangle

hope this and p.s i am also in k12

step-by-step explanation: