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Serjik [45]
3 years ago
6

A circle has a radius 30 cm. What is the area? Show your work.

Mathematics
1 answer:
Talja [164]3 years ago
8 0

Answer:

I believe the area = 2,826

Step-by-step explanation:

A=pie×radius²

A= 3.14×30²

A=3.14×900

A=2,826

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Find the critical value t for the confidence level c= 0.98 and sample size n=7.
kenny6666 [7]

Answer:

The critical value is T = 3.143.

Step-by-step explanation:

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 7 - 1 = 6

98% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 6 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.98}{2} = 0.99. So we have T = 3.143.

The critical value is T = 3.143.

8 0
3 years ago
HELP PLEASE!- the growth of a kitten is described by the equation y=2.5+4, where y represents the kitten's weight in ounces x we
erastovalidia [21]
4 is the X variable so it means it is 4 weeks after the kitten is born.
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5 0
4 years ago
Help me find surface area of this shape
lozanna [386]
The triangle <span>pyramid</span>  is made up of 4 triangles.

------------------------------------
Formula:
------------------------------------
Area of triangle = 1/2 x base x height

------------------------------------
Area of the bottom triangle:
------------------------------------
Area = 1/2 x 9 x 7.8
Area = 35.1 yd²

------------------------------------
Area of the 3 side triangles:
------------------------------------
Area = 3 [ 1/2 x 9 x 10 ]
Area = 135 yd²

------------------------------------
Total Area:
------------------------------------
Total Area = 135 + 35.1 
Total Area = 170.1 yd²

------------------------------------------------------------------------
Answer: Surface Area = 170.1 yd².
------------------------------------------------------------------------

4 0
3 years ago
Vivi is a drummer for a band. She burns 756756756 calories while drumming for 333 hours. She burns the same number of calories e
alexandr1967 [171]

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<u>hours:</u> 3

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-> to find this, we must split the number of calories evenly among the hours

<u>steps</u>

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6 0
3 years ago
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Mademuasel [1]

Answer:

4719

Step-by-step explanation:

4 0
3 years ago
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