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2 years ago

Please solve quickly

Mathematics

2 answers:

masya89 [10]2 years ago

5 0

Answer:

13.8 sq.cm

Step-by-step explanation:

Area of shaded region = area of square - area of 4 quater circles

(4 quater circles=1 circle)

= area of square - area of one circle

= s^2 - πr^2

= 8×8 - 3.14 × 4×4 (r = 4cm because radius is half of the side of square)

= 64 - 3.14 ×16

= 64 - 50.24

= 13.76

Nearest tenth of 13.76 is 13.8

shtirl [24]2 years ago

3 0

Answer:

41.2 cm^2

Step-by-step explanation:

Square area = 8x8 = 64 cm^2

The sum of the 4 white areas is a circle of radius r = 4cm

The area of the circle is $\pi r^{2} = 16\pi = 22.8 cm^2$

The yellow region is the difference = 64 - 22.8 = 41.2 cm^2

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Mileage tests are conducted for a particular model of automobile. If a 98% confidence interval with a margin of error of 1 mile

Llana [10]

Answer: 37

Step-by-step explanation:

Given : Significance level : $\alpha:1-0.98=0.02$

Critical value : $z_{\alpha/2}=z_{0.01}=2.33$

margin of error : E= 1 mile per gallon

Population standard deviation: $\sigma=2.6$ miles per gallon.

We know that when the population standard deviation is known then the formula to find the sample size is given by :

$n=(\dfrac{z_{\alpha/2}\times \sigma}{E})^2$

$n=(\dfrac{(2.33)\times 2.6}{1})^2=36.699364\approx37$ [Round to the next whole number.]

Hence, the required number of automobiles should be used in the test = 37

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3 years ago

Explain the distance formula. Than use it to calculate the distance between A(1, 1) and B(7, -7).

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The answer is 10 units.

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3 years ago

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Andre45 [30]

Answer: what are the answer choices ?

Step-by-step explanation:

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3 years ago

Given f(x)=x^2+4x+7 .

ivolga24 [154]

The correct answer for this question is A.

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3 years ago

A book sold 31,100 copies in its first month of release. Suppose this represents 7.8% of the number of copies sold to date. How

zvonat [6]

For this problem you can create a proportion.
Since 31,100 copies is 7.8% of the total copies spoke up to date you can make this proportion:
31,100. 7.8%
——— =. ———
x. 100%
Now you cross multiply and you will get
7.8x=3,110,000
After this you solve for x by isolating the variable.
7.8x/7.8. 3,110,000/7.8
x=398,717.949
Since the question asks you to round to the nearest whole number which is 7 then the final answer would be 398,718
Answer: There has been 398,718 copies sold to date.

5 0

3 years ago

Please solve quickly ​

Please solve quickly