X is a unknown
Number you need to find what the total of all the angles will be and the solve for x
b.an object at rest has an instantaneous acceleration of zero
Answer:
5.) b = -2/5 (or -0.4 in decimal form)
6.) 20.5
Division of a fraction is the equivalent of multiplying by its reciprocal
ex.

i suggest you try to remember this concept
in terms of your question
from this point, just multiple the numerators together and denominators together, then simplify if necessary
fyi- difference of squares

relating that to

also a side note, you might want to factor out the 4 first in the top fraction
The answer to the question