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Pie
2 years ago
9

Help! Don’t know, pls help! Pls show you work too, thank you!

Mathematics
1 answer:
evablogger [386]2 years ago
7 0

Answers:

  • Choice A
  • Choice B
  • Choice D

In other words, only choice C is false while the others are true.

==============================================================

Explanation:

The height of each bar represents the frequency for each group. It tells us how many students are in a certain interval. For example, the first bar has a height of 3 units to indicate there are 3 students between 140 and 155 cm.

Add up the heights of each bar to find the total number of students: 3+5+6+5+3+2 = 24

Statement A is correct because there are 24 students.

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

Statement B is also correct. This is because the highest value on the x axis is 230 and the lowest is 140. The range is the distance or gap between them. Subtract the values: 230-140 = 90.

The distance from the shortest height (140 cm) and tallest height (230 cm) is 90 cm, which is the range.

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

Unlike the previous two statements, choice C is not correct. Each bar represents a different interval. There are 6 bars, so there are 6 intervals (not 7).

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

Choice D however, is correct. Focus on any single bar. Look at where its left and right endpoints are located. The first bar for instance starts at x = 140 and ends at x = 155. The gap is 155-140 = 15 units wide.

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An electric pump can fill a 45-gallon tub in half an hour.At this rate, how long would it take to fill a 60-gallon tub?
zysi [14]
You can cross multiply to find the answer. Start by setting up your equation:

45/30 = 60/x  (30 represents half an hour)
Next, cross multiply, 45 times x, and 60 times 30: 

45x = 1800  you must isolate the "x" value by using the opposite operation it is involved in. Here we have 45x (x is multiplied to 45) so we must divide 45, which will cancel itself out, leaving us with "x."

What you do on one side of the equation, you must do on the other, so divide 1800 by 45 as well, which will leave you with 40.

Working it out on paper, your equation should now look like this: x=40, which represents the amount of time it will take to fill a 60 gallon tube.

Answer: It will take 40 minutes to fill a 60 gallon tube. 
8 0
3 years ago
There are bytes in a gigabyte. There are bytes in a megabyte. How many times greater is the storage capacity of a 1-gigabyte fla
anzhelika [568]

Answer: third option.

Step-by-step explanation:

You know that:

- There are 10⁹ bytes in a gigabyte.

- There are 10⁶  bytes in a megabyte.

Then, to know how many times greater  the storage capacity of a 1-gigabyte flash drive is than a 1-megabyte flash drive, you must divide 10⁹ bytes by 10⁶ bytes.

Remember the quotient of powers property:

\frac{a^m}{a^n}=a^{(m-n)}

Then:

=\frac{10^9}{10^6}=10^3=1,000 times greater

 

7 0
3 years ago
What % is 4485.00 of 28386.00 ?
tester [92]
Just an 15% 15.8% to be exact
3 0
3 years ago
Read 2 more answers
Two teachers purchase supplies for their classrooms.
inna [77]

Answer:

Cost of One Journal =  $3.99

Cost of One pen =  $0.59

Step-by-step explanation:

Let

Cost of One Journal = x

Cost of One pen = y

We can make equation from given statements.

Mr. Bowden purchases 18 journals and 40 pencils for $95.42.

18x+40y=95.42

Ms. Jacinto purchases 11 journals and 16 pencils for $53.33.

11x+16y=53.33

Now solving these equations to find the value of x

18x+40y=95.42--eq(1)\\11x+16y=53.33--eq(2)

Multiply eq(1) with 2 and eq(2) with 5

36x+80y=190.84\\55x+80y=266.65\\-\:\:\:\:-\:\:\:\;\:\:\:\:\:\:\:-\\---------\\-19x=-75.81\\x=\frac{-75.81}{-19}\\x=3.99\\

We get the value of x is: x=3.99

Now, putting value of x in equation 1 to find value of y.

18x+40y=95.42\\18(3.99)+40y=95.42\\71.82+40y=95.42\\40y=95.42-71.82\\40y=23.6\\y=\frac{23.6}{40}\\y= 0.59

So, we get the value of y: y = 0.59

Now, finding the costs:

Cost of One Journal = x = $3.99

Cost of One pen = y = $0.59

7 0
2 years ago
The length of a rectangle is 2/5 its width and the perimeter is 280 inches, what are the length and width of the rectangle?
bogdanovich [222]
If the length is 2/5, or .40, then:

280/.40= 700

Check my answer:

.40*700= 280

The length is .40 (or 2/5) the width is 700.

I hope this helped!
6 0
3 years ago
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