Answer:
sum of the first 27 terms = -1431
Step-by-step explanation:
<h3>arithmetic series sum of the first n terms formula:</h3>

n = 27 terms
first term, a = 25
common difference, d = 19 - 25 = -6
substitute the values into the formula





Answer:
4
Step-by-step explanation:
Answer:
D
Step-by-step explanation:
Answer:
A=1 B=3 C=1 D=2 E=6 F=8
Step-by-step explanation:
the second part is b= y=3 times2^x
Answer:
an angle greater than 180° and less than 360°.
Step-by-step explanation: