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
AfilCa [17]
3 years ago
9

Why do fractions need to have a common denominator before you add or subtract them?

Mathematics
1 answer:
djyliett [7]3 years ago
5 0
Fractions need common denominator to add or subtract them because without denominators a fraction is not a fraction, it is a whole number
Example - 2/8 is a fraction
                but 2 is not a fraction
You might be interested in
A television game has 6 shows doors, of which the contests must pick 2. behind two of the doors are expensive cars, and behind t
Katyanochek1 [597]
The answer to this question:
One car probability 82/120
No car probability = 24/120
At least one car probability= 96/120

I will focus answering the 3 doors probability since the 2nd door problem is solved in the previous problem. (brainly.com/question/5761449)

No car condition
1. 1st door consolation, 2nd door consolation=, 3rd door consolation= 4/6 * 3/5 * 2/4= 24/120
This was also can be found by: (4!/1!)/ (6!/3!) = 24/120

(At least one car probability)  is the opposite of (no car probability) In this case, the easier way is 
100% - (no car probability) = 120/120 - 24/120= 96/120

One car probability is (At least one car probability) - (2 car probability). It will be easier to count the 2 car probability and subtract the (At least one car probability) 
Two car condition:
1. 1st door car, 2nd door car, 3rd door consolation = 2/6 * 1/5 * 4/4 =8/ 120
2.1st door car, 2nd door consolation, 3rd door car =2/6 * 4/5 * 1/4 = 8/120
3. 1st door consolation, 2nd door car, 3rd door car= 4/6 * 2/5 * 1/4= 8/120
The total probability will be 8/120+ 8/120 + /120= 24/120
This was also can be found by: (2!) (4!/2!)/ (6!/3!) = 24/120

One car probability =  (At least one car probability) - (2 car probability)= 96/120-24/120= 82/120
3 0
3 years ago
What is the justification for each step in solving the inequality?<br><br> −7(3+8x)+5x≤1−62x
dangina [55]
Distribute -7 because of math
-21-56x+5x≤1-62x
add like terms because you aint chaingin nothing
-21-51x≤1-62x
add 62x to both sides (addition property of equality, where a=a and b=b, a+b=a+b) and also (addative inverse, a+(-a)=0) that turns the -62x to 0
-21+11x≤1
add 21 to both sides (additiona proerty of equality and addativeinverse)
11x≤22
divide both sides by 11 (division property of equality, if a=a and b=b, then a/b=a/b)
x≤2
5 0
3 years ago
Read 2 more answers
Yasmeen bought 16 pizzas for her grade level classes.
torisob [31]

Answer:

183.20

Step-by-step explanation:

9.95x16=159.20

159.20+24=183.20

4 0
3 years ago
One cell phone carrier charges 26.50 a month plus 0.15
Gwar [14]

So what do you need us to do for you?

4 0
3 years ago
Round to the nearest tenth if neccessary<br> 69.904 divided by 34
Cloud [144]

Answer:

2.056

rounded to the nearest tenth: 2.1

Plz mark brainliest!! :DD

7 0
3 years ago
Read 2 more answers
Other questions:
  • Don't know what to do :\\
    15·1 answer
  • Select the cone(s) that are similar to a cone with a height of 9 meters and a radius of 3 meters.
    9·1 answer
  • What is the slope of the line between (3, −4) and (−2, 1)? (1 point)
    14·1 answer
  • A rectangular picture frame measures 4.0 inches by 5.5 inches. To cover the picture inside the frame with glass costs $0.99 per
    7·2 answers
  • How many square feet of outdoor carpet will we need for this hole plz help now
    12·1 answer
  • HELP MEE PLEASE! PLEASE DONT MESS AROUND!​
    5·1 answer
  • What output corresponds with I2?
    14·1 answer
  • a wedding reception was being held at Stefanina's restaurant can you please show how you have the answer
    7·2 answers
  • find three consecutive even integers such that the sum of the smallest number and twice the middle number is 20 more than the la
    11·1 answer
  • Paolo purchased a shirt at store A. He paid $19.50 for the shirt. Raoul purchased the same shirt at store B for $22.35.
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!