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alukav5142 [94]
3 years ago
15

How do you do this mathematics problem D-3/5=5/8

Mathematics
1 answer:
Paladinen [302]3 years ago
4 0

Answer:

D = 49/40

Step-by-step explanation:

Solve for D:

D - 3/5 = 5/8

Put each term in D - 3/5 over the common denominator 5: D - 3/5 = (5 D)/5 - 3/5:

(5 D)/5 - 3/5 = 5/8

(5 D)/5 - 3/5 = (5 D - 3)/5:

(5 D - 3)/5 = 5/8

Multiply both sides of (5 D - 3)/5 = 5/8 by 5:

(5 (5 D - 3))/5 = 5×5/8

5×5/8 = (5×5)/8:

(5 (5 D - 3))/5 = (5×5)/8

(5 (5 D - 3))/5 = 5/5×(5 D - 3) = 5 D - 3:

5 D - 3 = (5×5)/8

5×5 = 25:

5 D - 3 = 25/8

Add 3 to both sides:

5 D + (3 - 3) = 25/8 + 3

3 - 3 = 0:

5 D = 25/8 + 3

Put 25/8 + 3 over the common denominator 8. 25/8 + 3 = 25/8 + (8×3)/8:

5 D = 25/8 + (8×3)/8

8×3 = 24:

5 D = 25/8 + 24/8

25/8 + 24/8 = (25 + 24)/8:

5 D = (25 + 24)/8

25 + 24 = 49:

5 D = 49/8

Divide both sides by 5:

D = (49/5)/8

8×5 = 40:

Answer: D = 49/40

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Vilka [71]
When we do the additive inverse property...we want to end up with a 0...so the inverse of 7 is -7 and the inverse of -8 is +8....we now have our new expression

-7 + 8

-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----
     -7    -6    -5  -4    -3    -2    -1    0     1      2    3     4     5      6    7     8
6 0
3 years ago
1/2 x + 2 = 1/6 x - 1 =
aksik [14]

Step-by-step explanation:

1/2x+2−1/6x=1/6x−1−1/6x

1/3x+2=−1

1/3x+2−2=−1−2

1/3x=−3

3*(1/3x)=(3)*(−3)

x=−9 <- ANSWER

3 0
3 years ago
The ratio of the ages (in years) of three children is 2:4:5. The sum of their ages is 33. What is the age of each child?
pickupchik [31]
We have 2x + 4x + 5x = 33 so 11x = 33 and x 3.

The children are 6, 12 and 15
5 0
3 years ago
1. A notebook costs $5 more than a folder. Greg purchased 3 notebooks and 2 folders and paid a total cost $30. What is the cost
stiv31 [10]
Answer
Notebook each =$4
Folder each = $9

First we write out what we know
Notebook = n
Folder = f
It says a notebook is +5 than a folder so
f = n +5
It says he bought 3 notebooks and 2 folders for $30
3n + 2f = 30

Because we know from the first equation
f=n+5, we can substitute that into the second equation for f

3n + 2(n+5) = 30
3n + 2n +10 =30. Now Combine like terms
5n +10 =30. Now isolate n by subtracting 10 from both sides
5n = 20. Now isolate n by dividing both sides by 5
n = 4

Now we do the same thing to find f
We substitute the value of n (4) into the equation 3n + 2f =30
3(4) +2f =30
12 +2f =30. Now isolate f by subtracting 12 from both sides
2f = 18. Now isolate f by dividing both sides by 2
f = 9


We check our work by inserting the n and f values we found into one of the equations
n + 5 = f
4 + 5 = 9
9 = 9. It worked it equals so it’s correct
8 0
1 year ago
Solve using the quadratic formula: 2x2-9x+12=0
marta [7]

Answer:

no solution

Step-by-step explanation:

For getting the nature of solution of the quadratic equation of the form:

ax² + bx + c = 0

We need to find Discriminant which is:

Discriminant (D) = b² - 4ac

  • If D < 0, there is no solution of equation.
  • If D = 0, there are two equal and real solution of equation
  • If D < 0, there are two real and distinct solution of equation

Here we have equation is:

2x² - 9x + 12 = 0

∴ a=2, b = -9, c = 12

⇒ D = 81 - 4 × 2 × 12 = -16 < 0

Hence, there is no solution of given equation.

5 0
3 years ago
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