Answer:
x = 11.4
Step-by-step explanation:
The sum of the angles of any triangle must add up to 180°. Since we have the expressions for each angle: 5x, 8x, and (2x +9), we can solve for the variable of 'x' by adding the expressions together and setting them equal to 180:
5x + 8x + (2x +9) = 180
Combine like terms: 15x + 9 = 180
Use inverse operations: 15x + 9 - 9 = 180 - 9
15x = 171 or x = 11.4
Check: 5(11.4) + 8(11.4) + 2(11.4) + 9 = 57 + 91.2 + 22.8 + 9 = 180
Answer:
The answer is: When the sample mean is not a whole number.
Explanation:
The "Sum of Squares" <em>(SS)</em> refers to the measure of the distance from the mean. This can be computed by subtracting each of the measurements from the mean. The difference will then be squared and the measurement results will be added together. This formula is known as "definitional formula." This is preferably used when the mean is a whole number and there are only a few number of scores.
On the contrary, the "computational formula" allows the calculation of the concept values. This is preferably used when the mean is not a whole number and when there are many scores.
Which is an arithmetic sequence?A)9, 12, 16, 20...B)9, 11, 13, 16...C)1, 5, 9, 13, 17...D)12, 14, 16, 18...
marta [7]
Answer: https://www.khanacademy.org/commoncore/grade-HSF-F-IF#HSF-IF.A.3
Step-by-step explanation:
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