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Studentka2010 [4]
3 years ago
8

What is the area of the circle?​

Mathematics
1 answer:
Alika [10]3 years ago
3 0

Answer:The area of a circle is pi times the radius squared (A = π r²)

Step-by-step explanation:The area of a circle is pi times the radius squared (A = π r²)

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1+cos2A /1-cos2A=cotA.cotA​
Allisa [31]

Answer:

See Explanation

Step-by-step explanation:

formulae \: to \: be \: used :  \\  \cos 2 \theta = 2 { \cos}^{2}  \theta - 1 \\ and \\ \cos 2 \theta = 1 - 2 { \cos}^{2}  \theta  \\  \\ now \: let \: us \: prove \: the \: given \: trigonometrical \:  \\ identity. \\  \\  \frac{1 +  \cos2A}{1  -   \cos2A}  = \cot \: A. \cot \: A \\ LHS =  \frac{1 +  \cos2A}{1  -   \cos2A}  \\  \\  =  \frac{1 +2 { \cos}^{2}   A- 1 }{1 - (1  - 2 { \sin}^{2}   A)}  \\  \\ =  \frac{1 +2 { \cos}^{2}   A- 1 }{1 - 1   + 2 { \sin}^{2}   A}  \\  \\ =  \frac{2 { \cos}^{2}   A }{2 { \sin}^{2}   A}  \\  \\ =  \frac{{ \cos}^{2}   A }{ { \sin}^{2}   A}  \\  \\  =  { \cot}^{2} A \\  \\  =  { \cot} A .{ \cot} A \\  \\  = RHS \\  \\ hence \: proved.

6 0
3 years ago
If h(x) = x – 7 and g(x) = x2, which expression is equivalent to(g*h)(5)? a (5 – 7)2, b (5)2 – 7, c (5)2(5 – 7), d (5 – 7)x2
asambeis [7]
H(x) = x - 7
g(x) = x^2
(g * h)(x) = x^2 (x - 7)
(g * h)(5) = 5^2 (5 - 7)
8 0
3 years ago
Lionfish are considered an invasive species, with an annual growth rate of 65%. a scientist estimates there are 7,000 lionfish i
sashaice [31]

The number of lionfish after 6 years will be 85,609. The recursive equation for f(n) will be f(n) = 4242.42(1.65)ⁿ - 1300n.

<h3>What is an exponent?</h3>

Consider the function:

y = a (1 ± r) ˣ

Where x is the number of times this growth/decay occurs, a = initial amount, and r = fraction by which this growth/decay occurs.

lionfish are considered an invasive species, with an annual growth rate of 65%.

Then the equation will be

f(n) = P(1.65)ⁿ

P = initial polulation

A scientist estimates there are 7,000 lionfish in a certain bay after the first year.

7000 = P(1.65)

      P = 4242.42

Then the equation will be

f(n) = 4242.42(1.65)ⁿ

The number of lionfish after 6 years will be

f(n) = 4242.42(1.65)⁶

f(n) = 85608.58

f(n) ≅ 85,609

If scientists remove 1,300 fish per year from the bay after the first year.

Then the recursive equation for f(n) will be

f(n) = 4242.42(1.65)ⁿ - 1300n

More about the exponent link is given below.

brainly.com/question/5497425

#SPJ1

4 0
2 years ago
12.com
NemiM [27]
Answer: base times height divided by two
4 0
3 years ago
The mean of nine test scores is 61. If a score of 71 is added to the group of scores, what is the new mean?
Fofino [41]
The answer is.

A.) 62
work:

61 x 9 = 549
549 + 71 = 620
620 / 10 = 62
5 0
3 years ago
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