How many significant digits are in 80,000


Answer 1
Answer: 2 because the equation can be reduced to: 8.0 x 10^4.
Answer 2
Answer: Actually it's 5 because there is no decimal space and if you only include 8 then that means the number is actually 8.

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What should be added to 3 to make the sum 0?



The answer is (-3) because if you have 3, you need to take away three in order to get to 0


the answer is 3

Step-by-step explanation:

Additive inverses:  

pairs of numbers that have a sum of zero.  

In a school 3/5are boys. In a day 1/6 were absent and 250 boys were present. How many girls are in that school



There are 200 girls in that school

Step-by-step explanation:

The correct and complete question is as folly;

In a school 3/5 pupils are boys. One day 1/6 of the boys were absent when 250 boys were present. How many girls are in the school?


Let the total number of students in the school be x students

Since 3/5 are boys , then the number of girls in the school would be 1-3/5 = 2/5

The number of boys are 3/5 * x = 3x/5

The number of girls are 2/5 * x = 2x/5

Now on a particular day, 1/6 of the boys were absent and 250 boys were present.

What this means is that the fraction of boys present is 1-1/6 = 5/6

Now, 5/6 of the total boys population were present.


5/6 * 3x/5 = 250

3x/6 = 250

x/2 = 250

x = 2 * 250 = 500

So there are 590 students in the school.

The number of girls in the school is ;

2x/5 = 2/5 * 500 = 200 girls

Mary and her family ordered a large pizza for dinner. Half of the pizza is plain and half of the pizza has pepperoni. Mary loves pepperoni so she ate 1/5 of the full pizza (all of which had pepperoni). How much of the remaining full pizza has pepperoni?



3/10 of the renaming full pizza has pepperoni

Step-by-step explanation:

Here, we want to calculate how much of the remaining pizza had pepperoni.

From the question, 1/2 has pepperoni and 1/2 is plain without pepperoni

she eats 1/5 of the pizza having pepperoni, this means that she is actually left with some parts is the half having pepperoni

The actual of the half remaining with pepperoni will be 1/2 - 1/5 = 3/10

This means that 3/10 of the remaining full pizza has pepperoni

The difference between the highest and lowest single game point totals for the MIDDLE HALF of the data is ______ points less for Joe's data than Sam's data. Therefore, the MIDDLE HALF of Joe's single game point totals are less varied than Sam's.



See Explanation

Step-by-step explanation:

The question is incomplete, as the required data to answer the question are missing.

However, the interpretation of the question is to determine the interquartile range (IQR) of a certain dataset.

Then get the difference between the calculated IQR & Joe's data and also the difference between the calculated IQR & Sam's data

Then, make comparison

To do this, I will use the following assumed datasets.

Data: 62, 63, 64, 64, 70, 72, 76, 77, 81, 81

IQR is calculated as:

IQR = Q_3 - Q_1

Q_3 is the\ median of the upper half

Q_1 is the\ median of the lower half

For Joe, we have:

Lower\ half: 62, 63, 64, 64, 70

Upper\ half: 72, 76, 77, 81, 81

The median is then calculated as:

M = (N + 1)/(2)

For, the lower half:

Q_1 = (5 + 1)/(2) = (6)/(2) = 3rd


Q_1 = 64

For the upper half:

Q_3 = (5 + 1)/(2) = (6)/(2) = 3rd


Q_3 = 77

When the same process is applied to Sam's data,

Q_1 = 52

Q_3 = 58

IQR = Q_3 - Q_1

IQR = 77 - 64

IQR = 13

Assume that:

Joe = 60

Sam = 65

Joe - IQR = 60 - 13 = 47

Sam- IQR = 65- 13 = 52

Hence, the IQR is 47 points less for Joe's data than Sam's

Explain how a division problem is like an unknown factor?


A division problem is unsolved, so it is an unknown factor until ithe problem is solved.

Use the subway train schedule below to answer the question. Train ScheduleTrainArrives Every...Red line4 minutesBlue line5 minutesYellow line6 minutes All three trains just arrived at the station. When will they next all arrive at the station at the same time? They will all arrive at the station in minutes.



60 minutes

Step-by-step explanation:

Given the schedule above :

Red line arrives every 4 minutes

Blue line arrives every 5 minutes

Yellow line arrives every 6 minutes

All three just arrives at the train station ; when next will they all arrive at the train station at the same time.

Obtain the lowest common multiple of each arrov time :

Lowest common multiple of 4, 5, 6



_3___1___ 5 __ 3

_5___1___ 5 __ 1

_____1 ___1 ___1

Hence, lowest common multiple :(2 * 2 * 3 * 5) = 60

Hemce, they all arrive at the train station at the same time after 60 minutes