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Alja [10]
3 years ago
13

Factorise 20x-28 help please it's maths

Mathematics
2 answers:
antoniya [11.8K]3 years ago
8 0
Your answer is 4(5x-7)


makvit [3.9K]3 years ago
5 0
20 and 28 can be divided by 4, so just take the 4 out so the answer should be 4(5x - 7)
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Help! Need by 10:30 to turn in and I'm confused!
Alecsey [184]

Answer:

8 boxes of tissues

5 bags of cough drops

Step-by-step explanation:

You need to write a system of equations.

x = number of tissue boxes

y = number of cough drop bags

x (number of tissue boxes) + y (number of cough drop bags) = 13 (total number of tissues and cough drops combined.

So, your first equation is

x + y = 13

Then, you need to write the second equation.

(1.69 [cost of 1 tissue box] * [number of tissue boxes]) + (1.19 [cost of one bag of cough drops] * [number of cough drop bags] = 19.47 [total cost of tissues and cough drops]

That's a lot to read, so here's the equation simplified!

1.69x + 1.19y = 19.47

Now, you have two equations:

x + y = 13

1.69x + 1.19y = 19.47

I would solve with the substitution method.

the first equation can be changed to x = 13 - y by subtracting y from both sides.

Then, your two equations are:

x = 13 - y

1.69x + 1.19y = 19.47

Now, you can plug in that value of x into the second equation!

1.69(13 - y) + 1.19y = 19.47

21.97 - 1.69y + 1.19y = 19.47

subtract 21.97 from both sides

-1.69y + 1.19y = -2.5

Add the y values

-0.5y = -2.5

divide both sides by -0.5

so, y equals 5 bags of cough drops

now that you know what y equals, plug it back into your original equation to find x!

x + y = 13

plug in y

x + 5 = 13

x = 8

so, x = 8 boxes of tissues

Hope this helps! Let me know if you have any questions!

8 0
3 years ago
When the discount period started, the price of a chair changed from $220 to $154. By what percent did the price of the chair dec
olga55 [171]

Answer:

it changed by -30 percent

7 0
2 years ago
Which is greater 8.2 or 8.23
faust18 [17]
I believe 8.23 is greater because 8.2 can be 8.20 so that’s why my answer is 8.23
8 0
3 years ago
Read 2 more answers
How to divide<br>Please Help Me!<br>I Need It​
jeka57 [31]

Answer:

where is the question

Step-by-step explanation:

I don't see it.

3 0
2 years ago
When a number is doubled, the result is 48. What is the number
ddd [48]
The number u looking for is 28
3 0
3 years ago
Read 2 more answers
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