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Vlad1618 [11]
3 years ago
7

Answers to questions 15,19,20,21 &25

Mathematics
1 answer:
GarryVolchara [31]3 years ago
7 0

Answer:

The answer to your question is below

Step-by-step explanation:

15. x² = 144

    x = √144

   x = ± 12

19. 9x² = 4

      x² = 4/9

      x = √4/9

    x = ± 2/3

20.

      25y² = -16

          y² = -16/25

          y = √-16/25

          y = ± 4/5 i

21. 16y² = 25

        y² = 25/16

        y = √25/16

        y = ±5/4

25.

       81 - 9x² = 0

       81 = 9x²

       81/9 = x²

         9 = x²

       √9 = x

        x = ± 3

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K/4 - 5k + 1 = 1<br> please
irinina [24]

Answer:

-19k ≠ 0

No solutions

Step-by-step explanation:

k/4 - 5k + 1 = 1

4 (k/4 - 5k + 1 = 1)

k-20k + 4 = 4

-19k ≠ 0

4 0
2 years ago
Consider the arithmetic sequence 13, 24, 35, ....
Nostrana [21]

Answer:  27

Step-by-step explanation:

The given sequence : 13, 24, 35, ....

Here, first term : a= 13

Common difference: d=24-13 =11

The nth term of arithmetic sequence is given by :-

a_n=a+(n-1)d

It is given that the nth term is 299, so put a_n=299, a=13 ; d=11

299=13+(n-1)11

Subtract 13 from both sides , we get

286=(n-1)11

Divide both sides by 11, we get

26=n-1

Add 1 on both sides , we get

n=27

Hence, the value of n= 27

4 0
2 years ago
Using 8(-20) in a real world situation
Paul [167]
Maybe, the price went down $20 eight times?
5 0
2 years ago
8.EE.8
IceJOKER [234]

For the first system, we have

1 - 3x + 3y = -8

or

-3x + 3y = -9

The second equation, however, tells us

-3x + 3y = 13

but -9 ≠ 13, so this system has no solution.

For the second system, notice that multiplying both sides of

4x - 8y = 6

by 1/2 gives

2x - 4y = 3

which is identical to the other equation in the system. Then all point (x, y) that lie on this line are solutions to the system, meaning there are infinitely many solutions.

4 0
3 years ago
Suppose you want to be sure that the total cost of the three items does not go over a certain amount. How can you use estimation
Bond [772]

Answer:

i don't konw

Step-by-step explanation:

5 0
3 years ago
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