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padilas [110]
3 years ago
11

A student has a 2% salt water solution and a 7% salt water solution. To best imitate salt water at a local beach, he needs 1 lit

er of a 3.5% salt water solution. He defines x as the amount of 2% solution and writes this equation:
0.2x + 0.7(x – 1) = 0.35(1)
He solves the equation and determines that x is about 1.17 liters. He interprets this as needing 1.17 liters of 2% solution to make 1 liter of 3.5% solution.

What errors did the student make? Check all that apply.

The percent values were written incorrectly in the equation.
The amount of 7% solution should be written as 1 – x, not x – 1.
The equation as written is solved incorrectly. x ≠ 1.17.
x must represent the amount of the more highly concentrated solution.
The interpretation is incorrect. 1 liter of 2% solution is needed to make 1.17 liters of 3.5% solution.
Mathematics
1 answer:
Aleks04 [339]3 years ago
4 0

Answer:

The percent values were written incorrectly in the equation.

The amount of 7% solution should be written as 1 – x, not x – 1.

Step-by-step explanation:

a and b

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Part 1:
emmasim [6.3K]
Here are my answers to the given questions above:
Part 1. Here is my example of a real life scenario that describes what is happening. Let us say, I have 2 cookies and the bottle of milk costs 11 dollars, and 3 cookies and 4 bottles of milk cost 24 dollars.
Part 2. 
y=11-2x
3x+4(11-2x)=24
3x+44-8x=24
-5x=-20
x=4
y=11-8
y=3
Therefore, each cookie costs 4 dollars, and a bottle of milk costs 3 dollars.
Hope this answer helps. Let me know if you need more help next time.
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7 0
3 years ago
Find the surface area of the cylinder. Type an exact answer in terms of pi.
Elodia [21]

Answer:

=150.79644...cm²

~150cm²

Step-by-step explanation:

cylinder surface area = 2 pi r h + 2 pi r²

5 0
2 years ago
Read 2 more answers
Algebra help please
leva [86]
The value of a would be 4.2, because the negatives cancel out each other.
4 0
3 years ago
How many triangles can be constructed with side lengths of 9.6 cm, 11.6 cm, and 21.2 cm?
nignag [31]

Answer:  A) 0 triangles

============================================================

Explanation:

Adding up the two smaller sides gets us 9.6+11.6 = 21.2, but this result is not larger than the third side of 21.2

For a triangle to be possible, we need to be able to add any two sides and have the sum be larger than the third remaining side. This is the triangle inequality theorem.

I recommend you cutting out slips of paper with these side lengths and trying it out yourself. You'll find that a triangle cannot be formed. The 9.6 cm and the 11.6 cm sides will combine to form a straight line that is 21.2 cm, but a triangle won't form.

As another example of a triangle that can't be formed is a triangle with sides of 3 cm, 5 cm, and 8 cm. The 3 and 5 cm sides add to 3+5 = 8 cm, but this does not exceed the third side. The best we can do is form a straight line but that's not a triangle.

In short, zero triangles can be formed with the given side lengths of 9.6 cm, 11.6 cm, and 21.2 cm

3 0
3 years ago
Given the sequence -3, 9, -27, 81, -243, ..., find the recursive formula.
ollegr [7]

Answer:

a(1)= -3

a(n)=a(n-1) (-3)

Step-by-step explanation:

hope this helps

8 0
4 years ago
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