Answer:
The area of triangle expressed as a monomial is 
Step-by-step explanation:
we know that
The area of a triangle is equal to
In this problem we have
substitute
Answer: B
Work:
Since the general formula of an arithmetic sequence is f(n) = (the first term) + (common difference)*(n-1), you just plug in what was given to you in the problem to that equation. The first term is -20 and the common difference is +15 since the the increase from one term to the next is 15. Doing so produces the equation f(n) = -20 + 15(n-1), which is choice B.
The measurement of angle x is 40°. these two triangle are congruent so their sides share the same length and their angles share the same degrees
I am pretty sure that this is it
