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raketka [301]
3 years ago
5

I need help...... someone plzzz help

Mathematics
2 answers:
bagirrra123 [75]3 years ago
8 0
The answer is 58 and 39
BaLLatris [955]3 years ago
8 0

Answer:

x is 58. y is 34

Step-by-step explanation:

x + y = 97.

x - y = 19

If you add the 2 equations together, isolate the variable x, and then plug that number into the first equation, you get these numbers.

x + y + (x - y) = 97 + 19

2x = 97 +19

2x = 116

divide both sides by 2

x = 58

plug it into the first equation and solve for y and you'll get 34.

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Solve the equation by completing the square round to the nearest hundredth is necessary x^2-x-7=0
masha68 [24]

The answers are 3.19 or -2.19.

In order to complete the square, you must first get the constant to the other side of the equation. WE do that by adding 7 to both sides.

x^2 - x - 7 = 0

x^2 - x = 7

Now we must take half of the x coefficient (-1), which would be -.5. Then we square it and add it to both sides. This is the second step to any completing the square problem.

x^2 - x = 7

x^2 - x + .25 = 7.25

Now that we have done that, the left side will be a perfect square so that, we can factor it.

x^2 - x + .25 = 7.25

(x - .5)^2 = 7.25

After having done that, we can take the square root of both sides

(x - .5)^2 = 7.25

x - .5 = +/-\sqrt{7.25}

Now we can take the value of that square root and solve.

x - .5 = +/-\sqrt{7.25}

x - .5 = +/-2.69

x = .5 +/- 2.69

And with the + and - both there, we need to do both to get the two answers.

.5 + 2.69 = 3.19

.5 - 2.69 = -2.19

4 0
2 years ago
What is the value of x in the equation 1/2x - 2/3 y = 30, when y = 15
hammer [34]

Answer:

Step-by-step explanation:

1/2x - 2/3 × 15 = 30

1/2x - 10 = 30

1/2x = 30 + 10

1/2x = 40

x = 40 × 2

x = 80

hope this helps

plz mark it bas brainliest!!!!!!!!!

6 0
3 years ago
Read 2 more answers
Please help me with this question!
mixer [17]

Hi! I'm happy to help!

To solve this, we have to divide the 18 pounds, in 1/8 portions. We do this with division. To make this problem easier to solve, we need to turn it into a multiplication problem (opposite of division). To still make the problem correct, we have to take the opposite of one of our numbers. Let's take 1/8, and turn it into 8, now we have the problem:

18×8=

Now all we have to do is multiply:

18×8=

144

He can make 144 croissants!

I hope this was helpful, keep learning! :D

7 0
2 years ago
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marin [14]

Answer:

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Step-by-step explanation:

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2 years ago
What is the rule for 5,6.7,8 and the other coulum 10,12,14,20
zavuch27 [327]
5 rule 10 ruled to the secondly power 48384
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