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AveGali [126]
3 years ago
14

Please help i been stuck on these type of problems for the last hr can sumone explain

Mathematics
1 answer:
slava [35]3 years ago
5 0
False
False
False
True?
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(1 point) consider the function f(t)=⎧⎩⎨⎪⎪⎪⎪0,−5,−6,6,t<00≤t<11≤t<7t≥7;f(t)={0,t<0−5,0≤t<1−6,1≤t<76,t≥7; 1. wr
sergij07 [2.7K]
f(t)=\begin{cases}0&\text{for }t

Recall that

u(t)=\begin{cases}0&\text{for }t

Take it one piece at a time. For t\ge0, we can scale u(t) by -5:

-5u(t)=\begin{cases}0&\text{for }t

If we shift the argument by 1 and scale by -5, we have

-5u(t-1)=\begin{cases}0&\text{for }t

so if we subtract this from -5u(t), we'll end up with

-5u(t)+5u(t-1)=\begin{cases}0&\text{for }t

For the next piece, we can add another scaled and shifted step like

-6u(t-1)+6u(t-7)=\begin{cases}0&\text{for }t

so that

-5u(t)+5u(t-1)-6u(t-1)+6u(t-7)=\begin{cases}0&\text{for }t

For the last piece, we add one more term:

6u(t-7)=\begin{cases}0&\text{for }t

and so putting everything together, we get f(t):

f(t)\equiv-5u(t)+5u(t-1)-6u(t-1)+6u(t-7)+6u(t-7)
f(t)\equiv-5u(t)-u(t-1)+12u(t-7)
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3 years ago
Which are the possible side lengths of a triangle
Scorpion4ik [409]

Answer:

The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

Step-by-step explanation:

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I need help with this one I’m not so sure about my answer (〒﹏〒) <br> 8+10v–4v
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Step-by-step explanation:

Hey There!

So all you have to do is combine like terms (10v and -4v)

10v-4v=6v

So your answer would be 8+6v

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Dovator [93]
9 + 3 +7 =19 blocks each day
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Which formula is used to calculate the standard deviation of sample data?<br>​
Reptile [31]

Answer:

Standard deviation (S) = square root of the variance

Standard deviation is the measure of spread most commonly used in statistical practice when the mean is used to calculate central tendency. Thus, it measures spread around the mean

Step-by-step explanation:

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