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3 years ago

PLEASE HELP! I WILL MARK YOU AS BRAINLIEST!

Mathematics

2 answers:

aleksklad [387]3 years ago

7 0

22/7x5x5( formula is pie x r2)

110/7 x5

550/7 (divide it)

78.571

2 DEC=78.570

steposvetlana [31]3 years ago

4 0

39.28 cm square

area of semi circle=(π×r^2)/2

radius=5cm

so (π×5^2)/2=78.55/2=39.275 which is gonna be in nearest 2 decimal is 39.28

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Answer:

The 90% confidence interval for pis (0.7342, 0.8658).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

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For this problem, we have that:

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3 0

3 years ago

WILL MARK BRAINLEST IF CORRECT HELP ME OUT

sveta [45]

Answer:

x = 12

Step-by-step explanation:

Equation: 0.52(x) + 0.72(4) = 0.57(x + 4)

0.52(x) + 0.72(4) = 0.57(x + 4) $\longmapsto$ Multiply

0.52x + 2.88 = 0.57x + 2.28 $\longmapsto$ Subtract 0.52x from both sides

2.88 = 0.05x + 2.28 $\longmapsto$ Subtract 2.28 from both sides

0.6 = 0.05x $\longmapsto$ Divide all sides by 0.05

x = 12

-Chetan K

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