Beth set up a blanket tent at the edge of the table. what is the measure of the angle, in degrees, between the floor and the blanket?

Since the triangle formed is right triangle, the angle between the floor and the table is 90 degrees. The sum of the angles of a triangle is 180 degrees. We already have the measure of the two angles. Therefore, the measure of the third angle is:
180 - 90 - 12 = 78 degrees