Answer:

Step-by-step explanation:
In a right triangle the tangent of an angle is the ratio of the opposite length over the adjacent*. In formulas,
Solving for x, using a calculator for the tangent, 
*I promise I didn't just spellcheck that.
Answer:
100 degrees
Step-by-step explanation:
The measure of angle T is 100 degrees.
Answer:
Number of books she has not read =8
Step-by-step explanation:
Number of books Tara has=160
Number of books she has read =Percentage of what she has read x Number of book s she has =95% x 160=152
Number of books she has not read =Number of books Tara has- Number of books she has read=160-152=8
Is this simultaneous equations?
if yes then the first step is
make one of the unknown as the subject
They are all larger than 90 degrees, and in a triangle they would all be obtuse angles.