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creativ13 [48]
2 years ago
5

3(2 + f) = -15A. 3B. 7C. -3D. -7​

Mathematics
2 answers:
Scilla [17]2 years ago
5 0

Answer:

D. (-7)

Step-by-step explanation:

3(2 + f) = (-15)

(3 . 2) + (3 . f) = (-15)

6 + 3f = (-15)

3f = (-15) - 6

3f = (-21)

f = (-21)/3

f = (-7)

svp [43]2 years ago
3 0

Step-by-step explanation:

6+3f=-15

subtract 6

3f=-21

then divide

f=-7

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The answer is "rate 12%, 14%, 16% and value 4000, 10000, and 7000".

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\to x + y = 2z\\\\\to x + y - 2z = 0

by calculating the value we have  3 equations that are:

\to x+y+z=21000\\\\\to 0.12.x +0.14.y +0.16z = 3000\\\\\to  x + y - 2z= 0\\

calculate the matrix by above-given value:

\left[\begin{array}{ccc}1&1&1\\0.12&0.14&0.16\\1&1&-2\end{array}\right]\left[\begin{array}{c}x&y&z\\ \end{array}\right] =\left[\begin{array}{c}21000&3000&0\\ \end{array}\right]

by solving the above matrix we get:

\left[\begin{array}{c}x&y&z\\ \end{array}\right] =\left[\begin{array}{c}4000&10000&7000\\ \end{array}\right]

\to \$ 4000 \text{ lent at} 12 \% \\\to \$ 10000 \text{ lent at} 14 \% \\\to  \$ 7000 \text{ lent at} 16\%\\\\

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Answer:

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