Answer:
D 81
Step-by-step explanation:
It is not prime. It can be divided by a number other than 1.
The first term is -43.
Explanation:
an = a + (n - 1)d
a12 = a + 11d = 56, first equation
a21 = a + 20d = 101, second equation
Subtract the second equation from the first equation, cancelling +a and -a
11d - 20d = 56 - 101
-9d = -45
d = 5
Subtitute d into the first equation
a + 99 = 56
a = -43
a refers to the first term, hence the first term is -43.
Answer:
false, true, false
Step-by-step explanation:
ahaha good one
Step-by-step explanation:
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