1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Korvikt [17]
3 years ago
9

Which expression is equivalent to -5(-2k+4)

Mathematics
1 answer:
Wittaler [7]3 years ago
7 0
If you distribute -5 to the things in the parenthesis you would get 10k-20 which is the same as -5(-2k+4)
You might be interested in
Could someone help with the questions in the images below? I found them difficult
zubka84 [21]
Question 1a - You have got this correct, the median mark is 35
Question 1b- To work out the range, you must do the largest value subtract the smallest value. For your data, this would be 57 - 13 = 44

Question 2 - You have drawn the lines in the correct places, but you have not used a ruler. In order to get full marks on a question like this you must use a ruler.

Question 3 - Your lower quartile and median is correct, to find the upper quartile, we do 3(n/4). 'n' is the number of data points - in this case 120.
120/4 = 30
30 x 3 = 90
Go across the graph at 90 to see when the line is hit.
From what I can tell, the Upper Quartile is 3.

Next just find the maximum value.
Again, by the looks of it, the Maximum value is 8.5.

Now you have all the data needed for the box plot.

Min = 0
LQ = 0.8
Med = 2.1
UQ =  3
Max = 8.5

Using this information, draw a box plot like you did on the previous question.
<em>Again, I must stress that any line that you draw (unless purposely curved) must be drawn with a ruler; even on the graph at the top, during you working out. If you do not use a ruler, marks can be lost/taken away.</em>

Question 4a - For the median on a cumulative frequency chart, you must find the halfway point in the data. For this, we do n/2. In this case, n = 40
40/2 = 20
Draw a line (using  ruler) across at 20 until you reach the line.
Draw another one down to help you read the number.
The median looks like 34 seconds.
Question 4b - For this question, we already know the Min, Med and Max. Now we must work out the LQ and UQ.

Remember, LQ = n/4
In this case, n = 40
40/4 = 10
Look across at ten and you will find that the LQ = 16 seconds

To work out the UQ, we multiply the LQ place by 3 3(n/4).
3 x 10 = 30
30 on the graph takes us up to 45 seconds.

We now know that the:
Min = 9
LQ = 16
Med = 34
UQ = 45
Max = 57

With this information, draw a box plot like you have in the previous questions.

Question 5 - Good things to always compare on box plots are the Min/Max/Range and the Inter Quartile Range.
The boys had a lowest minimum and a higher maximum, this means that their range is larger, resulting in a large spread of data in comparison to the girls.
The Inter Quartile Range is the difference between the Upper Quartile and the Lower Quartile (how wide the box is).
The boy IQR = 45 - 16 = 29
The girls IQR = 34 - 23 = 11
Again, the girls have much more concise results; even though they did not get the quickest result, they were more like one another.

Question 5a - The median in a box plot is always the line down the centre of the box. In this case:
Median = 24 marks
Question 5b - The IQR is always the UQ - LQ
With this data, the IQR is the following:
36 - 17 = 19 marks

Hope this helps
6 0
3 years ago
Factor the expression 20k + 50
Yuliya22 [10]
Answer is 10(2k+5)

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

Work Shown:

20k+50 = 10*2k + 10*5
20k+50 = 10(2k+5)

Note how we can distribute the 10 back in to check our work
10(2k+5) = 10(2k)+10(5) = 20k+50
so that confirms we have the right answer

Another thing to notice is that 10 is the largest factor that we can pull out of 20k and 50. The value 10 is the GCF (greatest common factor) of 20 and 50.
4 0
3 years ago
A ball is dropped from a height of 5ft and bounces to 60% of I?ts previous height in each subsequent bounce
Gelneren [198K]

Answer:

Im assuming youre trying to answer what is the 60% height, it would be 3ft

Step-by-step explanation:


7 0
3 years ago
The nth term of a sequence is 3n squared - 1
Pavlova-9 [17]
A -2
B -5
I think I might be wrong
3 0
3 years ago
The temperature at the south pole was 6 degrees at 8am. At 3 pm it was -18 degrees. By how many degrees did the temperature drop
olga2289 [7]

Answer:

24\°

Step-by-step explanation:

we know that

To determine how many degrees drop the temperature, find out the absolute value of subtract the temperature at 8 am from the temperature at 3 pm.

so

\left|-18-6\right|=24\°

7 0
3 years ago
Other questions:
  • If a 60-degree angle is bisected and then each new angle is bisected, what is the measure of the smallest angle formed?
    7·1 answer
  • Im really confused! How do i figure out this problem:
    9·2 answers
  • The sum of three numbers is 3. if the second number is subtracted from the sum of the first and third numbers, the result is 9.
    14·1 answer
  • There are three consecutive integers. The sum of the first two is 51 more than the third. Find the integers.
    13·1 answer
  • The sum of three consecutive integers is -177. What are those numbers?
    11·2 answers
  • For a school event, of the athletic field is reserved for the fifth-grade classes.
    5·1 answer
  • There are 28-right handed students in a class of 31. What is the probability that a student chosen at a random time will be left
    6·2 answers
  • Jacky is driving at a speed of 55 miles per hour. Let h represent the number of hours that Jacky drives at this speed. Write an
    5·1 answer
  • According to a survey of​ workers,6/50 of them walk to​ work,1/50 ​bike, ​10/50 carpool, and 33/50 drive alone. What percent of
    13·1 answer
  • Use the commutative property of addition to write an equivalent algebraic expression. 8 + 6x
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!