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slava [35]
3 years ago
6

I need help I don’t understand and I need to show my work who would help me??

Mathematics
2 answers:
stich3 [128]3 years ago
5 0

Answer: b

Step-by-step explanation:

In the last question, you wrote on a second equation "13x ...." kkk

Let's go:

We have to check each one answer in the following system:

x - 2y = 7

3x + 7y = 8

I can use the substituition method to solve this system...

x = 7 + 2y

3x + 7y = 8

3(7 + 2y) + 7y = 8

21 + 6y + 7y = 8

13y = 8 - 21

13y = -13

y = -1

x = 7 + 2.(-1)

x = 5

Finally, the correct answer is the second one (letter b).

Gre4nikov [31]3 years ago
4 0
The answer is B! I hope this helps. Enjoy the holidays
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I need help trying to figure this out I think I have and answer but I want to make sure.
yKpoI14uk [10]

Answer:

34

Step-by-step explanation:

The mean is calculated as

mean = \frac{frequency(midpoint)}{frequency}

let x be the missing frequency, then

Total frequency × midpoint

= (16 × 2) + 7x + (20 × 12) + (10 × 17) = 32 + 7x + 240 + 170 = 442 + 7x

Total frequency = 16 + x + 20 + 10 = 46 + x, thus

\frac{242+7x}{46+x} = 8.5 ( cross- multiply )

442 + 7x = 8.5(46 + x)

442 + 7x = 391 + 8.5x ( subtract 8.5x from both sides )

442 - 1.5x = 391 ( subtract 442 from both sides )

- 1.5x = - 51 ( divide both sides by - 1.5 )

x = 34

The missing frequency is 34

3 0
3 years ago
Ahmed made the model of the Financial Center at Sowwah Square for his school project. The height of the building model is 20 cm
12345 [234]

Answer:

Area = 1500 cm^{2}

Step-by-step explanation:

Area= height ×(Base 1 +base 2)

Area = 20 × (40+35)

Area = 20×75

Area = 1500 cm^{2}

7 0
2 years ago
How to find the greatest common factor of 24 and 90?
love history [14]
Well, they're both divisible by 2 (24 ÷ 2 = 12) (90 ÷ 2 = 45)
3 0
3 years ago
I put C but again I’m not really sure it’s the correct answer.
egoroff_w [7]

Answer:

A

Step-by-step explanation:

7 0
2 years ago
Find the value of 5x+6 when x=-2
jeka57 [31]

Answer:

-4

Step-by-step explanation:

5 times negative -2 is -10 and you just add 6 so the answer is -4

5 0
3 years ago
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