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2 years ago

What is ∑n=17(10n+90) equal to? Enter your answer in the box.

Mathematics

1 answer:

Illusion [34]2 years ago

6 0

Answer:

910

Step-by-step explanation:

$\sum_{n=1}^{7}(10n+90)\\\\=\sum_{n=1}^{7}(10n)+\sum_{n=1}^{7}(90)\\\\=10\sum_{n=1}^{7}(n)+90(7)\\\\=10(\frac{7(7+1)}{2})+630\\\\=10(28)+630\\\\=280+630\\\\=910$ <u />

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3 years ago

Is the open sentence 3z=2z+5 true or false when z=5?<br><br> A. True<br> B. False

inna [77]

Hey there!

If z = 5

we replace "z" with "5"

So, let's test out the problem to see if it is true or false

Problem becomes: $3(5) = 2(5) + 5$

Let's work this out

$3(5) = 15$

Problem becomes: $15 = 2(5) + 5$

$2(5) = 10$

Problem becomes: $15 = 10 + 5$

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So, therefore it looks like this statement/ sentence is $True$ !

~ $MeIsKaitlyn:)$

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3 years ago

What is the factored form of 8x^2+12x

Anestetic [448]

Answer:

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Step-by-step explanation:

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3 years ago

Which statement would be true if you evaluate the expression (560x70) ÷10

Marat540 [252]

Answer:

none

Step-by-step explanation:

No choice is correct.

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(560 x 70) ÷ 10 is 10 times smaller than 560 x 70

None of the choices show 560 x 70. They show 560 + 70 and 560 - 70.

Answer: none

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