Answer:
Point R(2,7) has coordinates of (x, y), where x = 2 and y = 7, so
- Across the y-axis = 7
- Across the x-axis = 2
Answer:
X = {8n – 7n – 1 : n ϵ N}
Y = {49 (n –1) : n ϵ N} — (1) [all terms divisible by 49]
X = {8n – 7n – 1}
= (1 + 7)n – 7n – 1
= 1 + nC1 7 + nC2 72 + ….. + nCn 7n – 7n – 1
= nC2 72 + …… + nCn 7n
= 49 [nC2 + nC3 7 + …. nCn 7n-2] — (2)
From (1) and (2),
X is divisible by 49.
Y has all multiples of 49.
X ⊂ Y
Answer:
b. To increase the accuracy of the research and prevent skewness in the idea.
Step-by-step explanation:
Random assignment ensures that any difference between groups recorded at the end of an experiment can be attributed to the experimental procedures. It refers to how you arrange the participants into required groups (different treatment and control groups). In the case of non-random assignment, the two major problems are generalisation of results and bias, which could lead to skewness in the idea of the experiment.
One of the importance of random assignment in this given experiment is to increase the accuracy of the research and prevent skewness in the idea.
Answer:
y = 22°
Step-by-step explanation:
the sum of the interior angles of a triangle is 180 degrees
40 + 2x = 180
2x = 140
x = 70
'x' and '5y' form a linear pair, meaning they add up to 180 degrees
x + 5y = 180
substitute 70 for 'x'
70 + 5y = 180
5y = 110
y = 22
Answer:
2√5
Step-by-step explanation:
