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3 years ago

Use the distributive property to write an expression7(3a+11b) Helpppp

Mathematics

1 answer:

sladkih [1.3K]3 years ago

8 0

Answer:

21a+77b

Step-by-step explanation:

7x3=21

7x11=77

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3 years ago

Please teach me on how to answer this question. (addmath question)

arsen [322]

We know that $\overline{x}=8$ so:

$\overline{x}=8\\\\\\\dfrac{\sum\limits_{k=1}^7\,x_k}{7}=8\qquad|\cdot7\\\\\\ \boxed{\sum\limits_{k=1}^7\,x_k=56}$

We want to calculate:

$\sum\limits_{k=1}^7\,\big(2x_k-3\big)^2=\sum\limits_{k=1}^7\,\big(4x_k^2-12x_k+9\big)=\\\\\\=\sum\limits_{k=1}^7\,4x_k^2-\sum\limits_{k=1}^7\,\big12x_k+\sum\limits_{k=1}^7\,9=4\sum\limits_{k=1}^7\,x_k^2-12\sum\limits_{k=1}^7\,x_k+\sum\limits_{k=1}^7\,9=\\\\\\=4\cdot672-12\cdot56+7\cdot9=2688-672+63=\boxed{2079}$

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3 years ago

Please help! And please explain how you did it!

Sunny_sXe [5.5K]

Answer:

Explanation:

turn 5/11 into a decimal: 0.45 which is LESS than 0.50 (0.5).

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3 years ago

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Use the distributive property to write an expression7(3a+11b)￼ Helpppp

Use the distributive property to write an expression7(3a+11b) Helpppp