Answer:
The 64th term of the arithmetic sequence is -1075.
Step-by-step explanation:
Arithmetic sequence:
In an arithmetic sequence, the difference between consecutive terms, called common difference, is always the same.
The nth term of an arithmetic sequence is given by:

In which
is the first term.
−4,−21,−38
First term -4, so 
Common difference of 
Thus


Find the 64th term of the arithmetic sequence
This is
. So


The 64th term of the arithmetic sequence is -1075.
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Answer:

Step-by-step explanation:
Let's do it part by part:
<u>Twice "a":</u>
This means 2 times a, or 2*a
<u>Cube of "a":</u>
This means a cubed, so a to the power 3, or 
Also note "is" means "equal" and "of" means "multiplication.
Twice a increased by cube of a means both parts are summed so we have:
\
This is the formula/equation