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Oliga [24]
4 years ago
8

Expand the following:2/5 (2x - 7)

Mathematics
1 answer:
melisa1 [442]4 years ago
6 0

Answer:

i think it is c  or d

Step-by-step explanation:

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5.44/2.13=2.55388061

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Solve using substitution <br> 7x-9y=-9<br> X=-9
Inessa05 [86]

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y=6

x=6.42

Step-by-step explanation:

7(-9)+9y=-9

-63+9y=-9

+63         +63

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4 years ago
1. Given points ????(3, −5) and ????(19, −1), find the coordinates of point ???? that sit 3/8 of the way along AB ,close to A th
Nastasia [14]

Answer:  The required co-ordinates of point C are (9, -3.5).

Step-by-step explanation:   We are given the points A(3, -5) and B(19, -1).

We are to find the co-ordinates of point C that sit 3/8 of the way along AB, where the point P is close to A than to B.

According to the given information, we have

\dfrac{AC}{AB}=\dfrac{3}{8}\\\\\Rightarrow \dfrac{AC}{AC+BC}=\dfrac{3}{8}\\\\\Rightarrow 8AC=3AC+3BC\\\\\Rightarrow 5AC=3BC\\\\\Rightarrow AC:BC=3:5.

So, point C divides the line segment AB in the ratio 3 : 5.

We know that

if a point Q divides a line segment joining the points S(a,b) and T(c,d), in the ratio m : n, then the co-ordinates of Q are

\left(\dfrac{mc+na}{m+n},\dfrac{md+nb}{m+n}\right).

Therefore, the co-ordinates of point C are

\left(\dfrac{3\times19+5\times3}{3+5},\dfrac{3\times(-1)+5\times(-5)}{3+5}\right)\\\\\\=\left(\dfrac{57+15}{8},\dfrac{-3-25}{8}\right)\\\\=(9,-3.5).

Thus, the required co-ordinates of point C are (9, -3.5).

3 0
4 years ago
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