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3 years ago

Does anyone know the answer to this please help

Mathematics

2 answers:

kondaur [170]3 years ago

8 0

I did this on paper at first because I wanted to see if it was correct, and I think it is, but I'll double check after I have posted this just incase. So, you need to solve for r to find the radius of the large circle, and you can do this by forming an equation:
(π × r²) + (π × 2r²) = 80π
2π × 3r² = 80π
÷ 2π
3r² = 40
÷ 3
r² = 13.33
√
r = 3.65

Because the radius of the larger circle is 2r, you need to multiply r by 2 to get 7.303 as your answer. I hope this helps!

asambeis [7]3 years ago

4 0

I believe it would be 26.6 and the larger radius would be 53.4

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kirill [66]

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3 years ago

The common difference in an arithmetic sequence is –2 and the first term is 47. What is the 29th term?

BlackZzzverrR [31]

An arithmetic sequence is an ordered list of numbers where the next number is found by adding on to the last number (ex: 2,5,8,11... is a sequence where 3 is added on to find the next number).

The equation for an arithmetic sequence is
$A_{n}=A_{1}+(n-1)d$

$A_{n}$ is the "n-th" number in the sequence (ex: is the first term in the sequence)
d is the number you add (common difference) to find the next number
The first number in the sequence is 47 so $A_{1}=47$
d=-2 because the question gives you that

$A_{n}=A_{1}+(n-1)d$
 $A_{29}=47+(29-1)(-2)$
 $A_{29}=47+(28)(-2)$
 $A_{29}=47+-56$
 $A_{29}=-9$

The answer is A. -9.

 

The answer is C. 158

For the second one, it gives you $A_{1}=4$ and $A_{}=18$
You can use this to find d

 $A_{n}=A_{1}+(n-1)d$
 $A_{3}=4+(3-1)d$
 $18=4+(3-1)d$
 $18=4+2d$
 $14=2d$
 $7=d$

Now you can just solve using the equation normally.
 $A_{n}=A_{1}+(n-1)d$
 $A_{23}=4+(23-1)(7)$
 $A_{23}=4+(22)(7)$
 $A_{23}=4+154$
 $A_{23}=158$

The answer is C. 158

8 0

3 years ago

Read 2 more answers

what is (5b with an exponent of 2 times 2b with an exponent of 2 in parenthesis with an exponent of 2 on the outside

Sloan [31]

Answer:

100 $b^{8}$