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nignag [31]
3 years ago
8

In 2 years, I will be twice as old as I was 5 years ago. My little brother is 3 years younger than I am. Our baby sister is 2 ye

ars younger than he is.
Mathematics
1 answer:
beks73 [17]3 years ago
7 0

Answer:

Step-by-step explanation:

let my present age=x

then 2(x-5)=x+2

2x-10=x+2

2x-x=2+10

x=12

my age=12 years

age of brother =12-3=9 years

age of sister= 9-2=7 years.

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Distance of Tunnel is 500 meters + Train travel rate is 20 meters per second = 25 seconds to pass through the tunnel only therefore the outstanding balance of 35 seconds x 20 meters per second =600 meters Train

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Total of length of train 600 meters and tunnel (500 meters) is 1,200 meters +30 seconds = TR of 20 meters per second

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3 years ago
What is the x-intercept of the line with this equation −5x+1/5y=15 ?
bulgar [2K]

9

Step-by-step explanation:

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6 0
3 years ago
How will the solution of the system change if the inequality sign on both inequalities
Ket [755]
<h2>Answer:</h2>

Shown below

<h2>Step-by-step explanation:</h2>

The first system of inequality is the following:

\left\{ \begin{array}{c}y>2x+\frac{2}{3}\\y

To find the solution here, let's take one point, say, (0,0) and let's taste this point into both inequalities, so:

<h3>FIRST CASE:</h3>

First inequality:

y>2x+\frac{2}{3} \\ \\ 0>2(0)+\frac{2}{3} \\ \\ 0>\frac{2}{3} \ False!

The region is not the one where the point (0,0) lies

Second inequality:

y

The region is the one where the point (0,0) lies

So the solution in this first case has been plotted in the first figure. As you can see, there is no any solution there

<h3>SECOND CASE:</h3>

First inequality:

y

The region is the one where the point (0,0) lies

Second inequality:

y>2x+\frac{1}{3} \\ \\ 0>2(0)+\frac{1}{3} \\ \\ 0>\frac{1}{3} \ True!

The region is not the one where the point (0,0) lies

So the solution in this first case has been plotted in the second figure. As you can see, there is a solution there.

CONCLUSION: Notice that when reversing the signs on both inequalities the solution in the second case is the part of the plane where the first case didn't find shaded region.

3 0
3 years ago
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