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4 years ago

Which is greater? 2.17 or 2.2

Mathematics

2 answers:

goldfiish [28.3K]4 years ago

8 0

Answer:

2.2

Step-by-step explanation:

zysi [14]4 years ago

8 0

Answer:

2.2 because the 2.2 can be 2.20

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Write the numbers in order from greatest to least. <br><br> 0.115, 0.15, 0.005, 0.5

Ronch [10]

Answer:

0.5, 0.15, 0.115, 0.005

Step-by-step explanation:

A number can be written from the greatest to the and the lowest to the highest when given a series of number. This series of number can be in mixed fraction forms, improper fraction or decimal. When a number is said to be written from the greatest to the lowest, it is called descending order but from the lowest to the greatest it is called ascending order.

From the list of the series of the decimal numbers given, writing the numbers in order from the greatest to the least number will choose the form:

0.5, 0.15, 0.115, 0.005

7 0

4 years ago

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

PLZ NEED HELP 10POINTS IK ITS NOT MUCH BUT I NEED THIS QUESTION ANSWERED

Darya [45]

6% purchased model and 26% model b. Because you add up the all of the people who were and weren’t happy for both so it was 35 people in total.

So for a you divide 2 by 35 and then multiply that by 100 and then round and you get 6%

For b you divide 9 by 35 mult. By 100 and then round you get 26%

6 0

3 years ago

Here is a tunnel for a toy train.

jonny [76]

The <em>total</em> area of all six faces of the tunnel is $614.197\pi$ square centimeters.

<h2>Procedure - Surface area of a tunnel for a toy train</h2>

The surface area of the solid ( $A$ ) used to represent the tunnel for a toy train is the sum of its six faces (two <em>semicircular</em> sections, inner <em>semicircular</em> arc section, outer <em>semicircular</em> arc section, two rectangles).

<h3>Determination of the surface area of the tunnel based on information of the diagram</h3>

We calculate the surface area as following:

$A = 2\cdot \frac{\pi}{2} \cdot [(10\,cm)^{2}-(8\,cm)^{2}] + \pi\cdot (8\,cm)\cdot (30\,cm) + \pi\cdot (10\,cm)\cdot (30\,cm) + 2\cdot (2\,cm)\cdot (30\,cm)$