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Hunter-Best [27]
3 years ago
11

Write an inequality to model the situation. a number exceeds 9.

Mathematics
2 answers:
d1i1m1o1n [39]3 years ago
5 0

Answer:

n ≥ 9

Step-by-step explanation:

sveta [45]3 years ago
4 0
n > 9 would be the answer

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The system of equations may have a unique solution, an infinite number of solutions, or no solution. Use matrices to find the ge
Leno4ka [110]

Answer:

Infinite number of solutions.

Step-by-step explanation:

We are given system of equations

5x+4y+5z=-1

x+y+2z=1

2x+y-z=-3

Firs we find determinant of system of equations

Let a matrix A=\left[\begin{array}{ccc}5&4&5\\1&1&2\\2&1&-1\end{array}\right] and B=\left[\begin{array}{ccc}-1\\1\\-3\end{array}\right]

\mid A\mid=\begin{vmatrix}5&4&5\\1&1&2\\2&1&-1\end{vmatrix}

\mid A\mid=5(-1-2)-4(-1-4)+5(1-2)=-15+20-5=0

Determinant of given system of equation is zero therefore, the general solution of system of equation is many solution or no solution.

We are finding rank of matrix

Apply R_1\rightarrow R_1-4R_2 and R_3\rightarrow R_3-2R_2

\left[\begin{array}{ccc}1&0&1\\1&1&2\\0&-1&-3\end{array}\right]:\left[\begin{array}{ccc}-5\\1\\-5\end{array}\right]

ApplyR_2\rightarrow R_2-R_1

\left[\begin{array}{ccc}1&0&1\\0&1&1\\0&-1&-3\end{array}\right]:\left[\begin{array}{ccc}-5\\6\\-5\end{array}\right]

Apply R_3\rightarrow R_3+R_2

\left[\begin{array}{ccc}1&0&1\\0&1&1\\0&0&-2\end{array}\right]:\left[\begin{array}{ccc}-5\\6\\1\end{array}\right]

Apply R_3\rightarrow- \frac{1}{2} and R_2\rightarrow R_2-R_3

\left[\begin{array}{ccc}1&0&1\\0&1&0\\0&0&1\end{array}\right]:\left[\begin{array}{ccc}-5\\\frac{13}{2}\\-\frac{1}{2}\end{array}\right]

Apply R_1\rightarrow R_1-R_3

\left[\begin{array}{ccc}1&0&0\\0&1&0\\0&0&1\end{array}\right]:\left[\begin{array}{ccc}-\frac{9}{2}\\\frac{13}{2}\\-\frac{1}{2}\end{array}\right]

Rank of matrix A and B are equal.Therefore, matrix A has infinite number of solutions.

Therefore, rank of matrix is equal to rank of B.

4 0
4 years ago
Can somebody help please and thank you!!
Dimas [21]

Answer:

(3x+12)+X=180

Step-by-step explanation:

Supplementary angles always equal 180

6 0
3 years ago
Read 2 more answers
Carlo is building a wooden box that is shaped like a cube he wants the box to have a volume of 64 in.³ how many square inches of
scoundrel [369]
4x4x4=64
the answer is 4
6 0
3 years ago
Read 2 more answers
What is the recíprocas Of 3/5
Alexandra [31]
Reciprocal is the flipping of the fraction. Like the reciprocal of 2/3 is 3/2. So just switch the numbers around. 
Reciprocal of 3/5=5/3
Hope this helps.
5 0
3 years ago
Through: (-5, -5), parallel to y = 3/5x + 3
Komok [63]

Answer:

\displaystyle y=\frac{3}{5}x-2

Step-by-step explanation:

We want to find the equation of a line parallel to:

\displaystyle y=\frac{3}{5}x+3

And passes through (-5, -5).

Recall that parallel lines must have the same slope.

Since the slope of our old line is 3/5, the slope of our new line must also be 3/5.

So, we know that the slope of our new line is 3/5 and it passes through (-5, -5).

Now, we can use the point-slope form given by:

y-y_1=m(x-x_1)

We will let (-5, -5) be (x₁, y₁). m is the slope or 3/5. Hence:

\displaystyle y-(-5)=\frac{3}{5}(x-(-5))

Simplify:

\displaystyle y+5=\frac{3}{5}(x+5)

Distribute:

\displaystyle y+5=\frac{3}{5}x+3

Subtract 5 from both sides:

\displaystyle y=\frac{3}{5}x-2

And we have our equation.

7 0
3 years ago
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