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daser333 [38]
2 years ago
13

Select all that justify the following statement.

Mathematics
1 answer:
algol [13]2 years ago
7 0
Distributive
commutative
addition
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A geology teacher takes her class on an annual field trip to analyze rock samples. They use randomized sets of
Tpy6a [65]
Second option would be the answer
8 0
3 years ago
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A solution containing 12% alcohol is to be mixed with a solution containing 4% alcohol to make 20 gallons of solution containing
stepan [7]

Answer:

Step-by-step explanation:

Given that a solution containing 12% alcohol is to be mixed with a solution containing 4% alcohol to make 20 gallons of solution containing 9% alcohol.

Let x gallons of 12% alcohol be mixed with y gallons of 4% alcohol.

Total gallons= x+y = 20

Alcohol content in the total mixture = 0.12x+0.04y =9% of x+y

0.12x+0.4y=0.09(20)\\12x+4y = 180

b) Two equations are

x+y = 20\\12x+4y = 180

c) This is of the form Ax = B

where A =\left[\begin{array}{ccc}1&1\\12&4\end{array}\right]

Inverse is \frac{1}{4-12} \left[\begin{array}{ccc}4&-1\\-12&12\end{array}\right]\\=\frac{-1}{8} \left[\begin{array}{ccc}4&-1\\-12&12\end{array}\right]\\

Solution set is A inverse *B

= x \    12.5\\y  \     7.5

7 0
3 years ago
Which is the graph of y= 3/4x-3?<br>Graph C<br>Graph B<br>Graph A<br><br><br><br>​
Brilliant_brown [7]
Graph A because the slope and y intercept is correct on that graph
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3 years ago
Three times a number increased by 7 is 100. Find the number.
velikii [3]

Answer:

31

Step-by-step explanation:

100-7= 93

93÷3=31

7 0
3 years ago
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How to solve -27/x^15
kompoz [17]

Answer:

\frac{-27}{x^{15}}=-\frac{27}{x^{15}}

Step-by-step explanation:

<em>If you just want to simplify -27/x^15, it is not very difficult. Here is the simple way.</em>

<em />

Given the expression

\frac{-27}{x^{15}}

solving

\frac{-27}{x^{15}}

\mathrm{Apply\:the\:fraction\:rule}:\quad \frac{-a}{b}=-\frac{a}{b}

=-\frac{27}{x^{15}}

Therefore,

\frac{-27}{x^{15}}=-\frac{27}{x^{15}}

8 0
4 years ago
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