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Anna11 [10]
4 years ago
8

I need an answer as soon as possible thank you

Mathematics
1 answer:
gtnhenbr [62]4 years ago
6 0

the 2nd one is the best answer

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Solve the system of linear equations by substitution x-y=-4 2x+y=4
mylen [45]

Answer:

Given:

x-y=-4

2x+y=4

Step-by-step explanation:

x-y=-4

2x+y=4

add both the equation, we get

⇒  x-y=-4

  2x+y=4

⇒3x=-4+4

⇒3x=0

⇒x=0

∴ to find the value of y, put the value of x in any one equation

⇒x-y=-4

⇒0-y=-4

⇒-y=-4

⇒y=4

∴ x=0, y=4

3 0
3 years ago
Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the dif
Orlov [11]

Answer:

n= p1+q1×p2 4pq

n= q2÷ 0.5= q4.5

5 0
3 years ago
A second bag of 40 marbles contains 11 red marbles, 9 blue marbles and 20 green marbles.
Goryan [66]

Answer:

Where is the first bag? We cant solve the question without knowing the marbles in the first bag

8 0
3 years ago
Read 2 more answers
tap a can till tank in 28 hours, while tap B can fill the same tank in 21 hours. if both taps are open together, how long will i
Lyrx [107]
24.5 hours

28+21=49

49/2=24.5
3 0
3 years ago
A roller coaster travels at a constant rate. If the roller coaster travels a total of 2,070 meters in 30 seconds, how many meter
worty [1.4K]

Answer:

I am pretty sure it is 69 meters per 1 second

Step-by-step explanation:

Because you divide 2070 with 30 and you get 69.

6 0
3 years ago
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