An acute angle is one that is less than 90 degrees. A 90 degree angle, a right angle, is shaped like an L. Since we are looking for one that is smaller than an L shape, the second one is an acute angle.
An obtuse angle is one that is greater than 90 degrees. The angle that is larger than an L shape, the first one is an obtuse angle.
A straight angle is a straight line. This is the third angle.
Since our plane is parallel to the xz plane, the x and z are independent of each other, i.e. they could be anything. So xz plane has an equation of y = 0. So if this plane is located 11 units to the right of the xz plane then its equation must be y = 11.
0 because companies A says he gets 80.000 dollars per year with a 1,000 dollars increase every year so companies B will higher have to wait 0 years to be higher than companies A
