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3 years ago

What's the area please help?

Mathematics

1 answer:

alexgriva [62]3 years ago

7 0

Answer:

48 units^2

Step-by-step explanation:

So i split the arrow to make it just one rectangle and one triangle

Area of rectangle

= 4×10

= 40 units^2

Area of triangle

= (12-10)×8×1/2

= 2×4

= 8 units^2

Total area of the arrow

= 40+8

= 48 units^2

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3 years ago

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3 years ago

Mara simplifies the expression: -(7x - 3y) + 2(x + 4). Her work is shown. In what step does she make a mistake?

likoan [24]

Correct steps are shown

Correct simplified expression is:

$-(7x - 3y) + 2(x+4) = -5x + 3y+8$

Solution:

Given that: Mara simplifies the expression

$-(7x - 3y) + 2(x+4)$

Correct steps are:

From given,

$-(7x - 3y) + 2(x+4)$

Use the distributive property,

a(b + c) = ab + bc

Therefore,

$-(7x - 3y) + 2(x+4) = -7x +3y + 2x + 8$

Group the like terms

$-(7x - 3y) + 2(x+4) = -7x + 2x + 3y + 8\\\\Combine\ the\ like\ terms\\\\-(7x - 3y) + 2(x+4) = -5x + 3y+8$

Thus the expression is simplified

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