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djverab [1.8K]
2 years ago
15

The point (-4,8) is the mid point of the line joining the points (a+b,3b) and (-2a,2b-3a) find the values of a and b

Mathematics
1 answer:
vredina [299]2 years ago
8 0

Answer:

a=28; b=20.

Step-by-step explanation:

1) 2*(-4)=(a+b)+(-2a) and .

2) using the two equations it is possible to make up (then solve) the next system:

\left \{ {{2*(-4)=(a+b)+(-2a)} \atop {2*8=3b+(2b-3a)}} \right. \ => \ \left \{ {{-a+b=-8} \atop {-3a+5b=16}} \right. \ => \ \left \{ {{a=28} \atop {b=20}} \right.

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Answer:

x² + 13x + 30

Step-by-step explanation:

(x + 3) (x + 10)

Expand the brackets.

x(x + 10) + 3(x + 10)

x² + 10x + 3x + 30

Add like terms.

x² + 13x + 30

6 0
3 years ago
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Madison and her sister went to the store together. After the store, Madison walked 2 blocks west to get a coffee and her sister
ladessa [460]

Answer: 5 blocks

Step-by-step explanation:

If they both walked in the same direction, they both will be the same distance from each other.

If Madison went to a coffee shop 2 blocks west from the store, and her sister went from the store they were previously at to her job 7 blocks west, then, since they walked in the same direction, they would only be 5 blocks away.

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dimaraw [331]

$6462.5

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SI = (5500 × 3.5 × 5) / 100

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The total value of the account after 5 years will be $6462.5

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3 years ago
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So she divided the 2/3 between 4 friends.

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3 years ago
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