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enot [183]
3 years ago
7

Hi can someone help me. i’ll give brainliest if u do it correctly

Mathematics
1 answer:
Gemiola [76]3 years ago
4 0

Answer:

9/10 or 90% i think

Step-by-step explanation:

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Subtract:<br> -9 - (-4)<br> = ?<br><br> Thanks :)
lbvjy [14]
-9+4=5 because two negative signs makes a positive
4 0
3 years ago
Read 2 more answers
Jessica deposits her summer babysitting earnings, $600, in a savings account. How many years will it take her to earn $150 in in
aev [14]

:) done ur welcome now give me brainliest........................................................................................................................................................................................................................................................

5 0
3 years ago
Problem PageQuestion The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate paramet
asambeis [7]

Answer:

<em>t = 1.51</em>

Step-by-step explanation:

<u>Exponential Model</u>

The exponential model is often used to simulate the behavior of a magnitude that either grow or decay in proportion to the existing amount of that magnitude.

The model can be expressed as

M=M_oe^{kt}

In this case, Mo is the initial mass of the radioactive substance and k is a constant which value is positive if the mass is growing or negative if the mass is decaying.

The value of k is not precisely given in the question, we are assuming k=-0.2

The model is now

M=M_oe^{-0.2t}

We are required to compute the time it takes the mass to reach one-half of its initial value:

\displaystyle \frac{M_o}{2}=M_oe^{-0.2t}

Simplifying

\displaystyle \frac{1}{2}=e^{-0.2t}

Taking logarithms

\displaystyle ln\frac{1}{2}=ln(e^{-0.2t})=-0.2t

Solving for t

\displaystyle t=-\frac{ln\frac{1}{2}}{0.2}=1.51

6 0
3 years ago
Is this correct?- <br><br> Also please don’t just say “yes” or “no”-
hichkok12 [17]

Answer:

a) No

b) No

c) No

d) Yes

3 0
3 years ago
Suppose the auction house from the preceding problem sold 200 tickets at $1 each, and had 16 prizes of $10 each. What is the new
Brilliant_brown [7]
200/160=1.25

200+160=360/1.25/160=200.8

so your answer is 0.8
4 0
4 years ago
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