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lorasvet [3.4K]
3 years ago
7

I need help please and thank you

Mathematics
1 answer:
nignag [31]3 years ago
5 0

Answer:

B. A square is a rectangle.

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What is the side length a in the triangle below?
grigory [225]

Answer:

a=5

Step-by-step explanation:

a^2+b^2=c^2

c^2-b^2=a^2

13^2-12^2=a^2

169-144=a^2

25=a^2

5=a

8 0
3 years ago
What is m&lt;CDJ ?<br>Enter your answer in the box.<br>​
Westkost [7]

Answer:

it is cGh

Step-by-step explanation:

6 0
3 years ago
Every chemical element goes through natural exponential decay, which means that over time its atoms fall apart. The speed of eac
Lesechka [4]

Answer:

Q(t) = 800e^{-0.0495t}

Step-by-step explanation:

The amount of the isotope after t seconds is given by the following exponential equation:

Q(t) = Q(0)e^{-rt}

In which Q(0) is the initial amount and r is the decay rate.

A sample of beryllium-11 was first measured to have 800 atoms.

This means that Q(0) = 800

The half-life of the isotope beryllium-11 is 14 seconds.

This means that Q(14) = 0.5Q(0)

We use this to find r.

Q(t) = Q(0)e^{-rt}

0.5Q(0) = Q(0)e^{-14r}

e^{-14r} = 0.5

\ln{e^{-14r}} = \ln{0.5}

-14r = \ln{0.5}

r = -\frac{\ln{0.5}}{14}

r = 0.0495

So

Q(t) = Q(0)e^{-rt}

Q(t) = 800e^{-0.0495t}

8 0
4 years ago
Jay J runs of a 1/3 mile in 4 minutes. A. If Jay J continues at the same speed, how long will it take her to run one mile?
Marat540 [252]

\bf \begin{array}{ccll} miles&minutes\\ \cline{1-2} \frac{1}{3}&4\\\\ 1&x \end{array}\implies \cfrac{~~\frac{1}{3}~~}{1}=\cfrac{4}{x}\implies \cfrac{1}{3}=\cfrac{4}{x}\implies x=12

4 0
4 years ago
2/3(2x-1)+2 1/3=7+1/2x
schepotkina [342]

Answer: x=4/5

<u>Step 1</u>

<u></u>2/3*2*(2*x-1)-x+2*7-7*2 = 0\\5/3*x-14-4/3+14 = 0\\5/3*x-14+38/3 = 0<u></u>

<u></u>

<u>Step 2</u>

<u></u>5/3*x-4/3 = 0\\(5/3*x-4/3)/2 = 0\\(5/3*x-4/3)/2 = 0 // * 2\\5/3*x-4/3 = 0<u></u>

<u></u>

<u>Step 3</u>

<u></u>5/3*x-4/3 = 0 // + 4/3\\5/3*x = 4/3 // : 5/3\\x = 4/3/5/3\\x = 4/5<u></u>

3 0
3 years ago
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