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wadepoolio8836
19.05.2020 •
Mathematics
Calculate the area of the polygons in the picture. All measurements are in cm.
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Ответ:
Why is there a b) in the middle of the polygon? Question creators, proofread your figures.
a) Two triangles and a kite
Top triangle (1/2)(5.53)(1.5)
Bottom triangle (1/2)(6)(2)
The kite is like two triangles with shared base 2+3=5 and combined height 7,
(1/2)(5)(7)
Adding it up,
area = (1/2)(5.53)(1.5) + (1/2)(6)(2) + (1/2)(5)(7) = 27.6475
27.6475 sq cm
b) Three triangles, including one right triangle
Area = (1/2) (6.7)(3) + (1/2)(6.2)(2.5) + 1/2(6.2)(2) = 24.
24 sq cm
Ответ:
34.5744 ≈ 35
Step-by-step explanation:
The formula for Margin of Error
= z × σ/√n
Where
z = z score of the confidence interval = z score of 95% = 1.96
σ = 15 pounds
n = number of samples = ??
Margin of Error = 5
Hence,
5 = 1.96 × 15/√n
Cross Multiply
5 × √n = 1.96 × 15
Divide both sides 5
√n = 1.96 × 15/5
√n = 1.96 × 3
√ n = 5.88
Square both sides
n = 5.88²
n= 34.5744
Approximately the size = 35