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trapecia [35]
2 years ago
7

Х = 4 3х — у = -1 How to solve ?

Mathematics
1 answer:
elena-s [515]2 years ago
7 0
3+ - 1 I hole this helped
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How many L of an 85% alcohol solution must be mixed with 6 L of a 55% alcohol solution to make a 65% solution?
zepelin [54]

Answer:

3 Liters of the 85% Solution

Step-by-step explanation:

You have to draw your buckets. I can't on computer so imagine the fraction bar is the bottom of the buckets.

\frac{85}{x}+\frac{55}{6}=\frac{65}{x+6}

Then we multiply the top of the buckets with the bottom:

85x+330=65x+390

Now we simplify and solve

20x=60

x=3

You need 3 liters of the 85% solution!

4 0
3 years ago
Fran has 7 sheets of paper for a colouring project. If she only uses 1/3 of a sheet of paper per drawing how many drawings can s
Sav [38]
So we can make an equation for this, being 7=1/3x, as that effectively says she can make 3 drawings per page.

Knowing this, we can multiply it by 3 to get x=21 (since if she can draw 3 drawings per page, we can imagine that if each drawing took a page she would need 3 times the pieces of paper), therefore she can make 21 drawings.
8 0
3 years ago
5 biscuits cost 40p altogether how much do 3 biscuits cost
STALIN [3.7K]
If 5 biscuits cost 40p

1 biscuit would cost (40p divided by 5) 8p

8p multiplied by 3 (to get 3 biscuits) would cost 24p

3 biscuits cost 24p
7 0
3 years ago
Read 2 more answers
Determine which consecutive integers do not have a real zero of f(x)=x^3+9x^2+8x-5 between them.
Bess [88]
I think the answer is -2,-1
7 0
3 years ago
Answer this ASAP please​
larisa86 [58]

Answer:

V = 339.12 yd^{3}

7 0
3 years ago
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