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3 years ago

Help!!!! It’s due tom

Mathematics

1 answer:

bogdanovich [222]3 years ago

8 0

The answer should be D.

The maximum amount she can add is 7 books and no more, so the first two are wrong. It’s also allowed to be exactly seven, which is why it would be a closed circle.

Hope this helps!

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The diameter if a sphere is 4 cm. What is the volume of the sphere

IRISSAK [1]

Answer:

Step-by-step explanation:

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4 years ago

All the following are equivalent to 2(2a + b ) +8, except ______.

Arlecino [84]

Answer:

Except 4(a+b+2)

Step-by-step explanation:

It's 4a+4b+8 when expand

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3 years ago

Driving from Chester to Boxerville, you see a sign that says you have seven miles to go. If the total length of the trip is 45 m

krek1111 [17]

45 - 7 = 38
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4 years ago

Read 2 more answers

I don’t understand this.. <br> will someone please help? Will mark Brainliest along with 20 points.

inn [45]

To say two quantities $a$ and $b$ "vary directly" with one another means that a change in one of the quantities results in a proportional change in the other quantity. For example, if $a=2b$ , then $b$ is proportional to $a$ by a factor of 2, or $a$ is proportional to $b$ by a factor of 1/2. In other words, if you change $b$ by some fixed amount, then $a$ changes by double that amount.

Mathematically this means there is some constant scaling factor $k$ such that $a=kb$ . In question 4, we're told $f(x)$ varies directly with $x^2$ , which means there's some $k$ such that

$f(x)=kx^2$

We're given that $f(x)=40$ when $x=2$ , so

$40=k\cdot2^2\implies40=4k\implies k=10$

Then when $x=5$ , we get

$f(5)=10\cdot5^2=10\cdot25=250$

- - -

For $a,b$ to "vary inversely" with one another means that a change in one quantity results in an "opposite" change in the other. In other words, if $a$ increases, then $b$ decreases, and vice versa.

Mathematically, this is the same as saying there is some fixed number $k$ such that $ab=k$ .

For example, if $k=1$ and we start with $a=1$ , then $b=1$ also. If we change to $a=2$ , then $b=\dfrac12$ ; if $a=10$ , then $b=\dfrac1{10}$ , and so on.

In question 5, we're told $f(x)$ varies inversely with $x$ , so that there is some constant $k$ for which

$x\,f(x)=k$

When $x=4$ , we have $f(x)=6$ :

$4\cdot6=k\implies k=24$

Then for $x=8$ , we get

$8\,f(8)=24\implies f(8)=3$

5 0

3 years ago

What is the distance rounded to the nearest tenth between the points (2 -2) and (6 3)

kotegsom [21]

Answer:

The distance between the points is approximately 6.4

Step-by-step explanation:

The given coordinates of the points are;

(2, -2), and (6, 3)

The distance between two points, 'A', and 'B', on the coordinate plane given their coordinates, (x₁, y₁), and (x₂, y₂) can be found using following formula;

$l = \sqrt{\left (y_{2}-y_{1} \right )^{2}+\left (x_{2}-x_{1} \right )^{2}}$

Substituting the known 'x', and 'y', values for the coordinates of the points, we have;

$l_{(2, \, -2), \ (6, \, 3) } = \sqrt{\left (3-(-2) \right )^{2}+\left (6-2 \right )^{2}} = \sqrt{5^2 + 4^2} = \sqrt{41}$

Therefore, the distance between the points, (2, -2), and (6, 3) = √(41) ≈ 6.4.

4 0

3 years ago