This problem is an example of an arithmetic series.
The common difference of the second term (15) with the first term (9) and the third term (21) with the second term (15) [15-9=6; 21-15=6] is 6.
The formula for solving this is:
An= A1 +(n-1)*d where An is the nth term, A1 is the first term, n is the number of terms and d is the common difference.
An=9+ (31-1)*6 = 189
The answer is 189.
Answer:
46 jumping jacks per minute
Step-by-step explanation:
184/4= 46
The value added to the equation 
exists 
.
<h3>What is a perfect square?</h3>
A perfect square exists as a number that can be described as the product of an integer by itself or as the second exponent of an integer.
The perfect square trinomial exists
± 
= 
± 2ab + 
then 
The value of a = x and b = 3
The value added to the equation exists .
To learn more about perfect square refer to: brainly.com/question/6946048
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Answer:
Slope is 2.
Step-by-step explanation:
y=mx+b, m= slope.
y-7=2x-20
y=2x-27
Answer:
X= -6
Step-by-step explanation:
x-4=2x+2
x-2x=2+4
X = -6
