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3 years ago

I need help solving number 7

Mathematics

2 answers:

solniwko [45]3 years ago

6 0

Read the sentence and write the equation:
x = the input #

The sum of the cube of the input = x^3
and 4 times the square of the input = 4x^2 and
the difference of the product of 5 and the number decreased by 7 = 5(x - 7)

Now put the terms together:
x^3 + 4x^2 - 5(x - 7)

puteri [66]3 years ago

3 0

I minimized the answers down to 1 and 4, the other two are not correct

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2 years ago

The hemmings borrowed $3 000 for home improvements. They repaid the loan and $600 in simple interest four years later. What simp

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Answer:

Step-by-step explanation:

Given that:

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2 years ago

3. If your siice a rectangular pyramid parallel to it base, what will be the shape of the cross section?

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2 years ago

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gizmo_the_mogwai [7]

Answer:

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3 years ago

Help answering this simple Series Question? I don't know what I did wrong!

Tatiana [17]

Looks like you just evaluated the summand for the given value of $n$ , whereas the question is asking you to find the value of the sum for the first $n$ terms.

Let $S_k=\displaystyle\sum_{n=1}^k\frac3{(-2)^n}$ . Then $S_k$ is the $k$ th partial sum.

$S_1$ happens to be the first term in the series, which is why that box is marked correct:

$S_1=\displaystyle\sum_{n=1}^1\frac3{(-2)^n}=\frac3{(-2)^1}=-1.5$

But the next partial sum is not correct:

$S_2=\displaystyle\sum_{n=1}^2\frac3{(-2)^n}=\frac3{(-2)^1}+\frac3{(-2)^2}=-0.75$

and this is not the same notion as the second term (which indeed is 0.75) in the series.

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2 years ago