Answer:
The integers 1, 2, 3, 4, 5, 6, 7, 8, and 9 are always significant.
Zeros in between numbers are always significant.
Step-by-step explanation:
There are three rules by which the number of significant figures can be determined:
- The digits which are other than the zero are said to be significant figures.
- Any zero which is present between two significant figure is said to be significant.
- The zero which appears in the right of the decimal portion in the end is significant. The zero which comes after the decimal is not significant.
The mean of the data set is 81.6.
The median of the data set is 80.
<h3>What is mean?</h3>
The mean is the average of a data set. Therefore,
Mean = (70 x 2 + 75 x 8 + 80 x 6 + 85 x 3 + 90 x 9) / 28 = 81.6.
Hence,
mean = 81.6
<h3>What is a median?</h3>
Median is a statistical measure that determines the middle value of a dataset listed in ascending order .
Therefore,
28 / 2 = 14
median = 80 + 80 / 2 = 160 / 2 = 80
learn more on mean and median here: brainly.com/question/28052298
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Answer: x = 45
Step-by-step explanation:
Quadrilaterals inscribed in a circle have all four vertices on the circle.
A unique property of these types of quadrilaterals is their angle measures: Opposite angles of inscribed quadrilaterals will always add up to 180 (they are supplementary angles).
As such, the inscribed quadrilateral ABCD has opposite angles at AC and BD. Because the quadrilateral is inscribed, this means that the angles A + C and the angles B + D will equal 180 degrees. We can represent the angles measures for B and D in an equation where B + D = 180:
When x = 45, the angle B is 40 degrees and the angle D is 140 degrees.
Factor the equation using difference of squares, which says that a^2-2ab+b^2=(a-b)^2.
a is 2 since the square root of 4 is 2 and b is 5 because the square root of 25 is 5.
Final answer: (2x-5y)^2
Answer: D
Sound waves with higher amplitudes sound louder than sound waves with lower amplitudes. Constructive interference will make a sound louder while destructive interference will make a sound quieter. Two waves that add together may have different frequencies.
