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ale4655 [162]
2 years ago
11

What is 4(-2)+(-3)(-5)?

Mathematics
2 answers:
Svetlanka [38]2 years ago
8 0
I say that the answer is 7 bc it’s -8+15
Degger [83]2 years ago
5 0
Answer is 7

-8 + (15) =7
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How many one fiths are in one​
Ivenika [448]

Answer:

5

Step-by-step explanation:

If you mean a whole, sorry if its incorrect

4 0
3 years ago
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
$45 CD player 6% tax Calculate the total including tax, tip or markup. pls show work
Yanka [14]

Answer:

the tax would be $2.70

Step-by-step explanation:

FIrst you would make the tax in decimal form then multiply the decimal with the cost, then you wil get the tax

6 0
3 years ago
Read 2 more answers
If CB =3(x+8) and AD= 4(x+3), find AB
kkurt [141]

CD=CA+AB+BD

AB=CD-CA-BD

AB=CD-BD-BD

AB=CD-2.BD

AB=CD-2(BC+CD)

AB=CD-2BC-2CD

AB=-(CD+2BC)

AB=-{98-6(x+8)}

AB= 6x-50

6 0
2 years ago
What is the area of a regular pentagon with a side of 7.2 and an apothem of 7
timofeeve [1]
The area of a regular polygon<span> is given by the formula which is expressed as:

</span>area = (½)(apothem<span>)(perimeter)
</span>
We calculate as follows:

area = (½)(7<span>)(7.2 x 5)
</span>area = 126 square units

Hope this answers the question.
5 0
3 years ago
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