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SashulF [63]
3 years ago
7

4/7 of what number is 28

Mathematics
2 answers:
kozerog [31]3 years ago
7 0

Answer:

44

Step-by-step explanation:

8_murik_8 [283]3 years ago
6 0

Answer:

112

Step-by-step explanation:

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Please help ASAP I’ll give brainliest
butalik [34]
Write the equations in matrix,

\left[\begin{array}{ccc}5&-1&1\\1&2&-1\\2&3&-3\end{array}\right]   \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =   \left[\begin{array}{ccc}4\\5\\5\end{array}\right]

Using row transformation,
R₂ <---> R₃ 

\left[\begin{array}{ccc}5&-1&1\\2&3&-3\\1&2&-1\end{array}\right]   \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =  \left[\begin{array}{ccc}4\\5\\5\end{array}\right]

Using,
R₂ ---> R₂ - 2R₃

\left[\begin{array}{ccc}5&-1&1\\0&-1&-1\\1&2&-1\end{array}\right]   \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =   \left[\begin{array}{ccc}4\\-5\\5\end{array}\right]

Using,
R₂ --- > (-1)R₂

\left[\begin{array}{ccc}5&-1&1\\0&1&1\\1&2&-1\end{array}\right]   \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =   \left[\begin{array}{ccc}4\\5\\5\end{array}\right]

Using row transformation,
R₂ <----> R₃
\left[\begin{array}{ccc}5&-1&1\\1&2&-1\\0&1&1\end{array}\right] \left[\begin{array}{ccc}x\\y\\z\end{array}\right] = \left[\begin{array}{ccc}4\\5\\5\end{array}\right]

Using,
R₂ ---> R₂ - R₁/5

\left[\begin{array}{ccc}5&-1&1\\0&11/5&-6/5\\0&1&1\end{array}\right]   \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =   \left[\begin{array}{ccc}4\\21/5\\5\end{array}\right]

Using,
R₃ ---> R₃ - 5R₂/11 

\left[\begin{array}{ccc}5&-1&1\\0&11/5&-6/5\\0&0&17/11\end{array}\right]   \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =   \left[\begin{array}{ccc}4\\21/5\\34/11\end{array}\right]

∴ 5x-y+z = 4 ====(i)
   11y-6z = 21 === (ii)
    17z=34 === (iii)

from iii,
z=2.
Plug z=2 in ii to get y, 
∴y=3.
Plug y and z values in i to get x,
∴x=1

Therefore the solution to the system of equations is (1,3,2)
3 0
3 years ago
miss Kelly's son storage closet is 3 feet long 3 feet wide and 7 feet high she. can she fit 67 boxes that each have one volume o
noname [10]
Volume is length times width times height so the closet's volume is 3x3x7 which equals 63 cubic feet. 

Because 63 is less than 67, she can not fix 67 boxes in her closet.
8 0
4 years ago
Read 2 more answers
Write the number 40/100 as tenths in fraction form and decimal form.
Stolb23 [73]
What is 40/100 as a decimal?
To write 40/100 as a decimal you have to divide numerator by the denominator of the fraction.
We divide now 40 by 100 what we write down as 40/100 and we get 0.4

And finally we have:
40/100 as a decimal equals <span>0.4</span>
5 0
3 years ago
Read 2 more answers
True or False:
Genrish500 [490]

Answer:

False

Step-by-step explanation:

False.

Gross income is the total amount a person earns before any deductions are taken out.

5 0
2 years ago
Read 2 more answers
Y+4x=10x-6 solve for x
7nadin3 [17]

Answer:

(y-6)/6 = x

Step-by-step explanation:

y+4x=10x-6

Subtract 4x from each side

y+4x-4x=10x-4x-6

y = 6x-6

Add 6 to each side

y +6 = 6x-6+6

y+6 = 6x

Divide by 6

(y-6)/6 = 6x/6

(y-6)/6 = x



8 0
4 years ago
Read 2 more answers
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