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Hatshy [7]
3 years ago
11

Simplify the expression.13[6^2/(5^2-4^2)+9] 181 169 26 585

Mathematics
1 answer:
Zina [86]3 years ago
7 0
So 5^2 -4^2 is 25-16 which is 9
6^2/9 is 36/9 which is 4 +9 is 13
13(13) is 169
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What is the equation of a circle with the center(-9,-5) and radius equals 9
mezya [45]

Answer:

(x+9)^2+(y+5)^2=81

Step-by-step explanation:

(x-h)^2+(y-k)^2=r^2

(h,k)=center

r=radius

so if you just insert the center (-9,-5) and the r with 9

(x-(-9))^2+(y-(-5))^2=9^2

(x+9)^2+(y+5)^2=81

Hope that helps :)

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3 years ago
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Scientist can determine the age of ancient objects by a method called radiocarbon dating. The bombardment of the upper atmospher
Artemon [7]

Answer: 2500 years

Step-by-step explanation:

I'm not quite sure if I'm doing this right myself but I'll give it a shot.

We use this formula to find half-life but we can just plug in the numbers we know to find <em>t</em>.

A(t)=A_{0}(1/2)^t^/^h

We know half-life is 5730 years and that the parchment has retained 74% of its Carbon-14. For A_{0 let's just assume that there are 100 original  atoms of Carbon-14 and for A(t) let's assume there are 74 Carbon-14 atoms AFTER the amount of time has passed. That way, 74% of the C-14 still remains as 74/100 is 74%. Not quite sure how to explain it but I hope you get it. <em>h</em> is the last variable we need to know and it's just the half-life, which has been given to us already, 5730 years, so now we have this.

74=100(1/2)^t^/^5^7^3^0

Now, solve. First, divide by 100.

0.74=(0.5)^t^/^5^7^3^0

Take the log of everything

log(0.74)=\frac{t}{5730} log(0.5)

Divide the entire equation by log (0.5) and multiply the entire equation by 5730 to isolate the <em>t</em> and get

5730\frac{log(0.74)}{log(0.5)} =t

Use your calculator to solve that giant mess for <em>t </em>and you'll get that <em>t</em> is roughly 2489.128182 years. Round that to the nearest hundred years, and you'll find the hopefully correct answer is 2500 years.

Really hope that all the equations that I wrote came out good and that that's right, this is definitely the longest answer I've ever written.

5 0
3 years ago
What is the equation of the function that is graphed as line a?
Ede4ka [16]
The answer would be y = 1/3x - 1. Your y-intercept is -1 and your slope is 1/3x. I hope this helps love! :)
4 0
3 years ago
For each pair of jeans i will buy 3 sweaters. how many sweaters can i buy if i have $255​
Zepler [3.9K]

You can buy 85 sweaters. Plze mark me brainiest:)

7 0
3 years ago
(18x3-3x2++x-1)/(x2-4)
Gwar [14]
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18x^5-3x^4-71x^3+11x^2-4x+4
4 0
3 years ago
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