(21/7) = 3
(6)^2 = 36
3+3(36) = 111
(x - 4y)²
(x - 4y)(x - 4y)
x(x - 4y) - 4y(x - 4y)
x(x) - x(4y) - 4y(x) + 4y(4y)
x² - 4xy - 4xy + 16y²
x² - 8xy + 16y²
Lets BC =x
8/5 = 32/x
8x =32 * 5
8x = 160
x = 160/8
x = 20
answer
BC = 20
Answer:
a) n = 100
s = 8
Confidence interval = 95%
Z at 95% = 1.96
Confidence interval formula : to
Substitute the values :
Confidence interval : to
Confidence interval : to
b)n = 200
s =11
Confidence interval = 90%
Z at 90% = 1.64
Confidence interval formula : to
Substitute the values :
Confidence interval : to
Confidence interval : to