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3 years ago

PLEASE please help i’ll give brainliest

Mathematics

1 answer:

elena55 [62]3 years ago

8 0

Answer:

Step-by-step explanation:

The correct answer is dotplot

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Elsa works in the furniture department of a store. She earns a 3.7% commission. If she sells $5200 worth of furniture this week,

kenny6666 [7]

The answer should be Elsa will earn $192.4 in commission

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3 years ago

Select the locations on the number line to plot the points 8/3 and −11/3.

Vadim26 [7]

OKAY THE 8/3 GOES 3 STEPS AHEAD OF FIVE AND THE ELEVEN GO THREE STEPS BACK FROM FIVE FROM GIVING AN EXAMPLE 5---1---1---3 THERE GOES AND THE OTHER 5---1---1---1---1---1---1---1---3---1---1 THERE IS HOPING TO HAVE HELPED YOU

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3 years ago

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 $R_3\rightarrow R_3-2R_2$

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

Apply $R_2\rightarrow R_2-R_1$

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

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

The algebra mat below models the equation x+3=5

Akimi4 [234]

X + 3= 5

The answer to this equation is simply 2

to do this:

subtract 3 from both sides of the equation.

3 cancels out, and you are left with this

x=2

so, the answer is x=2

or 2

Hope this helped!

7 0

3 years ago

A rental car agency charges $230 per week plus $0.25 per mile to rent car. How many miles can you travel in one week for $450

KonstantinChe [14]

Answer: 880 miles

Explanation:

Number of miles = x

Fixed = $230

Variable = $0.25 per miles

230 + 0.25x = 450

0.25x = 450 - 230

0.25x = 220

x = 220/0.25 = 880 miles

4 0

3 years ago