3 years ago

How do you expand

4} " align="absmiddle" class="latex-formula">

1 answer:

8 0

(x-1)^4 = (x-1)²(x-1)²=

=(x²-2x+1)(x²-2x+1)

& now you should know how to continue

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Alexxandr [17]

One of the possible estimates will be 85.6 inches.

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FrozenT [24]

3 or 9 could be an answer

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olga2289 [7]

i think its 2.5 because 15/6= 2.5 so 2.5t=h and the equation is kt=h so 2.5 makes the most sense.

I hope this helps

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2 years ago

likoan [24]

Let $v$ be the speed of train A, and let's set the origin in the initial position of train A. The equations of motion are

$\begin{cases}s_A(t) = vt\\s_B(t) = -\dfrac{8}{7}vt+450\end{cases}$

where $s_A,\ s_B$ are the positions of trains A and B respectively, and t is the time in hours.

The two trains meet if and only if $s_A=s_B$ , and we know that this happens after two hours, i.e. at $t=2$

$\begin{cases}s_A(2) = 2v\\s_B(2) = -\dfrac{16}{7}v+450\end{cases}\implies 2v = -\dfrac{16}{7}v+450$

Solving this equation for v we have

$2v = -\dfrac{16}{7}v+450 \iff \dfrac{30}{7}v=450 \iff v=\dfrac{450\cdot 7}{30} = 105$

So, train A is travelling at 105 km/h. This implies that train B travels at

$105\cdot \dfrac{8}{7} = 15\cdot 8=120 \text{ km/h}$

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Mumz [18]

Answer:

10 grams in 200ml because for 100ml is 5 grams

Step-by-step explanation:

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