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2 years ago

Susie bought 14 dolls this week. Last week she had 28 dolls. Which of the

Mathematics

1 answer:

tankabanditka [31]2 years ago

3 0

Answer:

B. 28 + 14 = x

Step-by-step explanation:

Susie bought 14 dolls this week. Last week she had 28 dolls. determine how many dolls Susie has now.

using this info we know that we must find the sum of both numbers.

Hence, Answer B has the correct equation

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3 years ago

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3 years ago

a rectangular lawn has an area of a^3 - 125. use the difference of cubes to find out the dimensions of the rectangle.

ANEK [815]

The area of a rectangle is the product of its dimensions

The dimensions of the rectangle are: $\mathbf{Length = a -5}$ and $\mathbf{Width = a^2 + 5a + 25}$

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$\mathbf{Area = a^3 - 125}$

Express 125 as 5^3

$\mathbf{Area = a^3 - 5^3}$

Apply difference of cubes

$\mathbf{Area = (a - 5)(a^2 + 5a + 5^2)}$

$\mathbf{Area = (a - 5)(a^2 + 5a + 25)}$

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$\mathbf{Area = Length \times Width}$

So, by comparison:

$\mathbf{Length = a -5}$

$\mathbf{Width = a^2 + 5a + 25}$