4 (2m-n) - 3 (2m-n) m=-15 and n= -18

Mathematics

2 answers:

KonstantinChe [14]4 years ago

7 0

The answer is -12...

TEA [102]4 years ago

3 0

Remember
ab-ac=a(b-c)
we can undistribute the (2m-n) to make it easier
4(2m-n)-3(2m-n)=(2m-n)(4-3)=(2m-n)(1)=(2m-n)

2m-n
for m=-15 and n=-18

2(-15)-(-18)
-30+18
-12

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Of the following two statements , which is a good definition ? Explain . " A rectangle is a parallelogram with 4 right angles .

Vikki [24]

This is about understanding the meaning of a rectangle and parallelogram.

Option A is the correct definition.

We are given the 2 statements as;

1) A rectangle is a parallelogram with 4 right angles

2) A rectangle is a parallelogram

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- A rectangle is defined as a quadrilateral with four right angles. This means all the angles are equal. It also has 4 sides with the length of opposite sides being parallel to each other.

- A parallelogram is defined as a quadrilateral that has two pairs of parallel sides with the opposite sides of such parallelogram having equal length and the opposite angles being equal.

Option A; This is correct because the reverse statement is that; A parallelogram is a rectangle with 4 right angles, This is possible because the only condition where a parallelogram is a rectangle is when it has 4 right angles.