A
Because the gradient of a vertical line is undefined.
Answer:
D. Systematic sampling
Step-by-step explanation:
- Systematic sampling is a type of probability sampling method in which sample members of a large population are selected according to a random starting position and a constant, periodic interval.
- This interval, called the sample interval, is calculated by dividing the population size by the desired sample size.
- so correct option is D. Systematic sampling .
Point B is the midpoint of line segment AC
so 2 * (AB) = AC
2(3x) = 5x + 21
6x = 5x + 21
x = 21
Answer:
x = 4 and y = 8
Step-by-step explanation:
Using the tangent and cosine ratios in the right triangle and the exact values
tan30° = , cos30° =
tan30° = = = ( cross- multiply )
x = 4 ( divide both sides by )
x = 4
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cos30° = = = ( cross- multiply )
y = 8 ( divide both sides by )
y = 8
451.538 rounded to tenths place = 451.5
answer is c. 451.5 (third choice)