Answer:
90m
Step-by-step explanation:
AB = 18m
BC = AB + 9 = 18 + 9 = 27m
Perimeter = 2(AB + BC)
= 2( 18 + 27)
= 2 x 45
= 90m
Answer:
113.04 cm²
Step-by-step explanation:
area of a circle= πr²
= 3.14 x 6²
=3.14 x 36
= 113.04 cm²
Answer:
n = -3
Step-by-step explanation:
Let the number be n. Then (2/3)n-4 = 2n.
Solve for n. To accomplish this, start by mult. both sides by 3, to remove the fractional coefficient: 2n - 12 = 6 n, or -12 = 4n. then n = -3 (answer)
(Sqrt 87)/16
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Answer:
Reject the null hypothesis.
Step-by-step explanation:
n1 = 16
n2 = 21
S.V1 = 5.8
S.V2 = 2.4
= 0.05
= Population Variance 1 ≤ Population Variance 2
= Population Variance 1 > Population Variance 2
Test statistic value = 5.8 / 2.4 = 2.417
Degrees of freedom is n - 1
15 and 20
Critical value is
= 2.2
2.417 > 2.2
we reject the null hypothesis as the critical value is greater than the test statistic.