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earnstyle [38]
3 years ago
12

Subtract. Express your answer in simplest terms. 3/4 - 3/5

Mathematics
2 answers:
bazaltina [42]3 years ago
5 0
3/4 - 3/5

common denominator is 20

15/20 - 12/20 = 3/20

3/20 is your answer

multiply the opposite denominator with current numerator to get your new numerator number

hope this helps
KiRa [710]3 years ago
4 0
3/20 



,,.,.,,.,.,.,.,.,.,.
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Joe can cut and split a cord of firewood in 3 fewer hours than Dwight can. When they work​ together, it takes them 2 hours. How
aalyn [17]

Answer:

Dwight will take 6 hours to finish the job alone and Joe will take 3 hours to finish the job alone.

Step-by-step explanation:

Let us assume the time taken by Dwight to split a cord of firewood  = K hrs

So, the per hour rate of Dwight  = (\frac{1}{K})

As, Joe uses 3 LESS hours then Dwight.

So, the time taken by Joe to split a cord of firewood  = (K- 3) hrs

So, the per hour rate of Joe  = (\frac{1}{K-3})

Now, when both of them wok together, it takes them 2 hours.

So, the per hour rate of BOTH of them  = (\frac{1}{2})

⇒ Per hour rate of ( Dwight  + Joe)  =(\frac{1}{2} )

\implies (\frac{1}{K}) +  (\frac{1}{K-3}) = (\frac{1}{2})

Now, solving for the value of K , we get:

(\frac{1}{K}) +  (\frac{1}{K-3}) = (\frac{1}{2})\\\implies  \frac{(K-3) + K}{K (K-3)}  = (\frac{1}{2})\\\implies 2(2K -3) = K^2 - 3K\\\implies k^2 - 3K -4K +6 = 0\\\implies K^2 - 7K  + 6=  0\\\implies K^2 - 6K - K  + 6=  0\\\implies K(K-6) -1(K - 6)=  0\\\implies (K-6)(K-1) = 0

Implies either K = 6 Or K = 1

But if K = 1, (K-3)  = 1- 3  = -2 hours would be A CONTRADICTION.

⇒ K  = 6 hours

Hence, Dwight will take 6 hours to finish the job alone and Joe will take (k-3) = (6-3) = 3 hours to finish the job alone.

8 0
3 years ago
Whats is 4 hundreds 13 tens 5 ones in standard form
mars1129 [50]
<span>4 hundreds 13 tens 5 ones = 400+13*10+5
                                        = 400+130+5
                                        = 535</span>
6 0
3 years ago
Please Help me!!! I have 5 more Questions left to ask.
Delicious77 [7]
Use photomath it will also help
5 0
3 years ago
Read 2 more answers
X² + 7x + 12 factorise it​
Sidana [21]

Step-by-step explanation:

x²+7x+12

x²+4x+3x+12

x(x+4)+3(x+4)

(x+3)(x+4)

hope it helps

4 0
2 years ago
This is due in two hours i will give you brainliest
VLD [36.1K]
It’s rather b or d. I’m not sure where to go from there though, sorry :(
8 0
3 years ago
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