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mrs_skeptik [129]
3 years ago
5

Math question please show work for brainliest :)

Mathematics
1 answer:
grigory [225]3 years ago
5 0

Answer: Choice B) 388

Note: this is my best guess (see below for what I mean)

--------------------------------------------------------------

Explanation:

Unfortunately we will have to make a few educated guesses as to the heights of some of the histogram bars. This is due to how the y axis scale is set up. There is too much of a gap when the y increment is 20 units.

The first bar appears to be 20 units high. The second bar is about 30 units high (midpoint of 20 and 40). The third ba is slightly above 40 but not the midway point, so I'd say maybe 42 or so. The fourth bar is 60 units high (more or less). The fifth bar is at about the halfway point of 60 and 80, so it looks like it's 70 units high. The sixth bar is slightly lower than 60 so I'd say 58 is its height. Continue this process and you'll see the list of values shown in the attached image below. Each height is listed directly above the bar it corresponds to.

The heights are then added up: 20+30+42+60+70+58+45+38+19+7 = 389

Since each bar is 1 unit wide, this means that each bar has an area of 1*height = height. In other words, the height of the bar is the same as the area of the bar. If we add up all the heights, we effectively add up all the areas. So the estimated area under this histogram is roughly 389 square units. Keep in mind that I used educated guesses to determine the heights of the bars, so it's likely not to be a perfect method. However, the value 389 is very close to 388 which is choice B. So that's why I'm thinking the final answer is choice B.

Note: if you can, ask your teacher for clarification on how tall each bar is using numeric values (instead of a visual indicator like the histogram).

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Answer:

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Step-by-step explanation:

1.) 30-18= 12 which is the number of member that had an average of 84

2.)Then multiply  12 times 84 = 1008

3.) You multiply 18 by 92 which equals 1656

4.)Add 1008 and 1656 together  and get 2664.

5.)Divide 2664 / 30 and you get the average of 88.8

Hope this helps :)

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While grading her students' most recent quiz on equation solving, Mrs. Jones calculated that approximately forty percent of her
EastWind [94]

The given equation is,

3(-n+4)+5n=2n

Part 1:

Solve the above equation for n.

Using distributive property of multiplication,

\begin{gathered} -3n+3\times4+5n=2n \\ -3n+12+5n=2n \end{gathered}

Now, group the like terms.

-3n+5n-2n+12=0

Now, add the like terms.

\begin{gathered} -5n+5n+12=0 \\ 0=-12 \end{gathered}

0=-12 is a false statement.

Since we obtained a false statement, the given equation has no solution.

So, option b is correct.

Part 2:

The option (a) is n=3.

If while solving an equation, a single value is obtained for the variable, then the equation has only a single solution. If n=3 is obtained after solving the equation, then the student should chose option (a) as the answer.

The option (b) is "no solution".

While solving an equation, if we obtain an equation which is mathematically false, then the equation will have no solution. So, no solution is chosen when no value is obtained for n and the final equation is mathematically false.

The option (c) is "infinitely many solutions".

While solving an equation, if we obtain an equation which is mathematically correct such as 0=0, 7=7 etc., then the equation will have infinietly many solutions. So, infinitely many solutions is chosen when no value is obtained for n and the final equation is mathematically correct.

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10 months ago
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