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kotegsom [21]
3 years ago
14

(-2.05) - (-5) explain and show how u did this

Mathematics
2 answers:
ira [324]3 years ago
8 0

Answer:

2.95

Step-by-step explanation:

−2.05−(−5)

=−2.05−(−5)

=−2.05+5

=2.95

Anna [14]3 years ago
5 0

Answer:

2.95

Step-by-step explanation:

When we have a problem like this (-2.05)-(-5)

It becomes -2.05+5 because two negatives make a positive, then we add them and we get 2.95

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4a + (–6b) – 3a + 2b factor the expression
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Answer:

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Step-by-step explanation:

Combine Like Terms:

=4a+−6b+−3a+2b

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have a great day

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3 years ago
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The height, h, in feet of a piece of cloth tied to a waterwheel in relation to sea level as a function of time, t, in seconds ca
irinina [24]

Answer:

d) 40 sec

Step-by-step explanation:

We have been given that the height h, in feet of a piece of cloth tied to a waterwheel in relation to sea level as a function of time, t, in seconds can be modeled by the equation h=15cos(\frac{\pi}{20})t. We are asked to find the time it will take for the waterwheel to complete one turn.  

To solve for time we need to find the period of the given cosine function.

We know that general form of a cosine function is in form y=a\cdot\text{cos}(bx)+c, where,

a = Amplitude,

\text{Period}=\frac{2\pi}{b}

We have been given b=\frac{\pi}{20}. Substituting this value in period formula, we will get:

\text{Period}=\frac{2\pi}{\frac{\pi}{20}}

\text{Period}=\frac{20*2\pi}{\pi}

\text{Period}=20*2

\text{Period}=40

Therefore, it will take 40 seconds for the waterwheel to complete one turn and option 'd' is the correct choice.  

4 0
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