3 years ago

Need help learning 3rd grade perimeters n areas

1 answer:

7 0

Perimeter is all sides added up.

Area is sometimes length times width with four sided figures like a rectangle or a square and for like triangles it is base times height.

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lorasvet [3.4K]

Answer:

Combine like terms, although the provided answer is missing a "-" sign in front of the "13."

Step-by-step explanation:

Combine like terms. The -7 and -6 can be added to produce -13.

The correct result is -13 - 2x^2 = -2x^2 + 1 [Not _13- 2x² = _2x² + 1

Perhpas the initial equation is written incorrectly(?)

8 0

2 years ago

Shkiper50 [21]

Answer:

C. Hollow cone frustum

Step-by-step explanation:

Revolved it in my head, because the line isn't touching the triangle it will be hollow, because the triangle has a slope the shape will taper.

3 0

3 years ago

777dan777 [17]

$\displaystyle\\\sum_{n=3}^5(-2x-4n)=-2x-4\cdot3+(-2x)-4\cdot4+(-2x)-4\cdot5\\\sum_{n=3}^5(-2x-4n)=-6x-12-16-20\\\sum_{n=3}^5(-2x-4n)=-6x-48$

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4 years ago

Aleksandr-060686 [28]

Do 40x10=400. Then do 40x6=240. Lastly, add 400+240=640.

3 0

4 years ago

Vesna [10]

8 because 2 3 5 7 11 13 17 19

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3 years ago