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Maslowich
2 years ago
10

A car was stopped at a red light. When the light turns green, the car reaches a speed of 21 miles per hour in 8 seconds. What is

the acceleration, to 1 decimal place?
Mathematics
2 answers:
s2008m [1.1K]2 years ago
6 0

21 divided by 8 = 2.625

Then round 2.625

                    2.630

Next you takeaway everything after 0.030

To get the awnser of 2.6

rosijanka [135]2 years ago
5 0

21 / 8 = ?

21 / 8 =  2.625

2.625 = 2.6

2.6 miles acceleration per second.

I hope this helps!

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bagirrra123 [75]
<span> (x + 3) • (x - 12)
</span>

The first term is, <span> <span>x2</span> </span> its coefficient is <span> 1 </span>.
The middle term is, <span> -9x </span> its coefficient is <span> -9 </span>.
The last term, "the constant", is <span> -36 </span>

Step-1 : Multiply the coefficient of the first term by the constant <span> <span> 1</span> • -36 = -36</span> 

Step-2 : Find two factors of  -36  whose sum equals the coefficient of the middle term, which is  <span> -9 </span>.

<span><span>     -36   +   1   =   -35</span><span>     -18   +   2   =   -16</span><span>     -12   +   3   =   -9   That's it</span></span>


Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -12  and  3 
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Step-4 : Add up the first 2 terms, pulling out like factors :
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              Add up the last 2 terms, pulling out common factors :
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Step-5 : Add up the four terms of step 4 :
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             Which is the desired factorization

Final result :<span> (x + 3) • (x - 12)</span>
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