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stich3 [128]
3 years ago
13

Is ( - 1, 2) a solution of the system y > x and x + y > 0?

Mathematics
1 answer:
kow [346]3 years ago
8 0

Answer:

Yes, because (-1,2) is a solution to both inequalities

Step-by-step explanation:

2>-1 so the first inequality is correct

-1+2>0 so the second inequality is correct

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Two trains A and B are 240 miles apart. Both start at the same time and travel toward each other. They meet 3 hours later. The s
otez555 [7]

Answer: Train A = 50 mph; Train B = 30 mph

Step-by-step explanation:

In this case, let's call the speed of both trains as:

Va: speed of train A

Vb: speed of train B

As train A is faster than train B, let's call speed of train B as X; So if Vb is X, then Va would be:

Vb = X

Va = X + 20

If we combine both Speed, we have:

V = Va + Vb = X + X + 20 = 2X + 20

Now that we have an expression for the combined speed, let's recall the formula for speed in general:

V = d/t

Where:

d: distance = 240 miles

t: time = 3 hours

Combining all the data we have:

V = 240/3

but V is 2X + 20 so:

2X + 20 = 240/3

Solving for X:

2X + 20 = 80

2X = 80 - 20

2X = 60

X = 60/2

X = Vb = 30 mph

Now that we know speed of one train, we can know the speed of the other train:

Va = 30 + 20 = 50 mph

8 0
3 years ago
Craig writes 3x + 5y - x - 4y = 3 +9y. Can you spot the 2 mistakes he has made?​
fenix001 [56]

Answer:

first 5y-4y does not equal 9y.

second 3x-x is 2x but he put 3.

Step-by-step explanation:

Math - Answered Sun.Sept.19.2021

If It Helped Please Rate And Heart.

6 0
2 years ago
Read 2 more answers
Is the simplified form of 2 v3 · 2 v6 rational?
tatuchka [14]

Answer:

No

Step-by-step explanation:

2√3 × 2√6

= 4√18

= 4√9*2

= 4( 2√2)

= 8√2

Just multiply the numbers under the radical together.  √3 × √6 = √18.  √18 can be written as √9*2, or 3√3.

√2 is irrational, so the answer will be irrational

5 0
3 years ago
Which system of the inequalities is shown in the graph
jolli1 [7]

Answer:

C

Step-by-step explanation:

the equation of the parabola is : y = x² - 3x

the equation of the line is y = x + 1

and the shaded area is between those graphs

therefore y ≥ x² - 3x and y ≤ x + 1

6 0
3 years ago
I'm so confused and need help ​
siniylev [52]

Answer:

SAS, SSS, AAA

Step-by-step explanation:

Because Im bored  X D

6 0
4 years ago
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