3 years ago

Is 1/4 of 200 greater than 1/2 of 100

Mathematics

1 answer:

MAVERICK [17]3 years ago

6 0

No beacuse 1/4 would be less that 1/2 it's common sense

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Two passenger train, A and B, 450 km apart, star to move toward each other at the same time and meet after 2hours.

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

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

5 0

3 years ago

A d + b = 180

serg [7]

I know B is true, but i’m unsure for the other choices.

7 0

3 years ago

Y=3x+6 complete with the table

Mama L [17]

Answer:

y=3,6,9,12,15

Step-by-step explanation:

Y=3x+6

y=3(-1)+6

y=3

y=3(0)+6

y=6

y=3(1)+6

y=9

y=3(2)+6

y=12

y=3(3)+6

y=15

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3 years ago

Read 2 more answers

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Kobotan [32]

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3 years ago

jenna brought a spool of ribbon that was 5 3/4 meters long. she used 3 1/4 meters of ribbon for a craft project. how many meters

sp2606 [1]

Answer:

So the answer will be 2 2/4

Step-by-step explanation:

If you need me to explain more please tell me.Hope it helps.

8 0

3 years ago