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Digiron [165]
3 years ago
15

A solid has 20 vertices and 30

Mathematics
1 answer:
Gnesinka [82]3 years ago
5 0

Answer: it’s 12

Step-by-step explanation:

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Emily added 5 grams of water into 20 grams of 50% salt solution.
atroni [7]
Answers:
She made ___25___ grams of ___40___% salt solution

------------------------------------------------------------------

The given info "20 grams of 50% salt solution" tells us that we have 10 grams of pure salt
Since 50% of 20 = 0.50*20 = 10
Put another way, we have 10 grams of pure salt out of 20 total so 10/20 = 0.50 = 50% salt solution

The 20 grams of solution updates to 25 grams of solution when we add the 5 grams of water
We don't add any salt, assuming this water is fresh water

So we still have 10 grams of pure salt out of 25 grams now
10/25 = 2/5 = 0.40 = 40% is the new salt concentration

5 0
3 years ago
What is the negative inverse of -0.3
TEA [102]

n\to negative\ of\ n=-n\\\\n\to inverse\ of\ n=\dfrac{1}{n}\\\\n\to negative\ inverse\ of\ a=-\dfrac{1}{a}\\\\-0.3=-\dfrac{3}{10}\\\\negative\ inverse:\\\\-\left(-\dfrac{10}{3}\right)=\dfrac{10}{3}

3 0
3 years ago
It is possible to multiply a 3 x 5 matrix and a 3 x 5 matrix.<br> O True<br> O False
oksian1 [2.3K]

Answer:

False

Step-by-step explanation:

In order to perform matrix multiplication, the number of columns in the first matrix must be the same as the number of rows in the second matrix.

In this case, the number of columns in the first matrix is 5 and the number of rows in the second column is 3 therefore they aren't the same value, hence, cannot be multiplied

5 0
2 years ago
I neeeed help asaspp thank you
stiks02 [169]

Answer:

<h2>The answer is (2,-4)</h2>

Step-by-step explanation:

<h2><u><em>PLS MARK AS BRAINLIEST!!!</em></u></h2>
5 0
2 years ago
An astronomer hosts a stargazing party for $775. If the group tips the astronomer 15%, what is the total amount that the astromo
marta [7]

Answer:

891.25

Step-by-step explanation:

775x0.15=116.25

775+116.25=891.25

7 0
2 years ago
Read 2 more answers
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