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5th degree monomial

Step-by-step explanation:

5 is the highest degree, thus 5th degree.

monomial because it is only 1 term, not three or more

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for