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3 years ago

Pleeeassee help its quiet simple i promise its just that im young lol please add explanation

Mathematics

2 answers:

nlexa [21]3 years ago

7 0

Answer:

10c -4d

Step-by-step explanation:

3c - 9d +7c + 5d

Combine like terms

3c +7c -9d +5d

10c -4d

velikii [3]3 years ago

5 0

Answer:

10c - 4d

Step-by-step explanation:

1. Rearrange the problem so similar variables are closer together

3c + 7c + 5d - 9d

2. Simplify the problem by adding like terms

3c + 7c = 10c

5d - 9d = -4d

3. Rewrite the problem so the variables are in ABC order

10c - 4d

Hope this helps :)

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3 years ago

On a coordinate plane, triangles R S T and L M N are shown. Triangle R S T has points (5, 5), (2, 1), and (1, 3). Triangle L M N

ivolga24 [154]

Answer:

LMN has a larger area

Step-by-step explanation:

Given

RST

$R =(5,5)$

$S= (2,1)$

$T = (1,3)$

LMN

$L = (0,-1)$

$M= (2,-4)$

$N= (-2,-3)$

Required

Compare both areas

The area of triangle is:

$Area = \frac{1}{2}|x_1y_2 - x_2y_1 + x_2y_3 - x_3y_2 + x_3y_1 - x_1y_3|$

For RST, we have:

$Area = \frac{1}{2}|5*1 - 2*5 + 2*3 - 1*1 + 1*5 - 5*3|$

$Area = \frac{1}{2}|-10|$

Remove absolute signs

$Area = \frac{1}{2}*10$

$Area = 10$

For LMN, we have:

$Area = \frac{1}{2}|x_1y_2 - x_2y_1 + x_2y_3 - x_3y_2 + x_3y_1 - x_1y_3|$

$Area = \frac{1}{2}|0*-4-2*-1+2*-3--2*-4--2*-1-0*-3|$

$Area = \frac{1}{2}|-14|$

Remove absolute signs

$Area = \frac{1}{2}*14$

$Area = 7$

<em>By comparing both areas, we can conclude that LMN has a larger area</em>

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