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Marat540 [252]
3 years ago
11

Use a common denominator to find negative 2/3 plus negative 4/5

Mathematics
2 answers:
leonid [27]3 years ago
5 0
-10/15 + -12/15 = -1 6/15. -2/3 becomes -10/15 when multiplied by 5. -4/5 becomes -12/15 when multiplied by 3.
SIZIF [17.4K]3 years ago
4 0

answer:

\frac{22}{15} or 1 \frac{7}{15}

step-by-step explanation:

a common denominator between 3 and 5 is 15

first to get our denominator in the fraction \frac{2}{3} to 15 we need to multiply by 5 so 2 × 5 = 10 and 3 × 5 = 15

this makes our new fraction \frac{10}{15}

now we need to get our denominator in the fraction \frac{4}{5} to 15 so we need to multiply by 3 so 4 × 3 = 12 and 5 × 3 = 12

this makes our new fraction \frac{12}{15}

our new equation with common denominators is now \frac{10}{15} + \frac{12}{15} = coming out to be \frac{22}{15}

to make this into a mixed fraction we know 22 only goes into 15 once with 7 left over so our mixed fraction is 1 \frac{7}{15}

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Simplify this expression 9xy4x 3x3y​
Alekssandra [29.7K]

Answer:

81 x y^5

Step-by-step explanation:

Simplify the following:

9×3×3 x y^4 y

3×3 = 9:

9×9 x y^4 y

9 x y^4×9 y = 9×9 x y^(4 + 1):

9×9 x y^(4 + 1)

4 + 1 = 5:

9×9 x y^5

9×9 = 81:

Answer: 81 x y^5

7 0
3 years ago
Use prime factors to determine the HFC of 90 and 126​
Gala2k [10]
Highest common prime factor is three

6 0
2 years ago
Read 2 more answers
When 1 is subtracted from three- tenths of the number, the result is equal to one-fifth of a number. What is the number
Bas_tet [7]
Based on the given mathematical statement, it can be rewritten into a mathematical equation to simplify and to be solved easily. The statement, "When one is subtracted from three-tenths of a number" corresponds to the equation, 3x/10 - 1, that is assuming the number is represented by the variable x. This is equal to one-fifth of the number. In other words,
3x/10 - 1 = x/5
x = 10
8 0
3 years ago
An​ alligator's tail​ length, T, varies directly as its body​ length, B. An alligator with a body length of 4.5 feet has a tail
Amiraneli [1.4K]
If and only if it is a proportional relationship, the problem can be solved by creating a proportion of B1/T1=B2/T2. This can also be expressed as 4.5/3.5=5.4/x given the values. You must cross multiply, so 4.5x=3.5(5.4). This simplifies to x=4.2. So, the tail length would be 4.2 feet.

Hope this helps.
3 0
3 years ago
PLEASE HELP! GIVING POINTS :)!
Stells [14]

Answer:

8 23/40

Step-by-step explanation:

8 and 5 have 40 in common. To get from 8 to 40 you need to multiply by 5. You have to do the same to the top and bottom numbers in the fraction. 3/8 turns into 15/40. To get from 5 to 40, you need to multiply by 8. Again, u have to do the same for the top and bottom. 1/5 turns into 8/40. 15/40 + 8/40 = 23/40. Add the whole numbers, 6 and 2, to get 8. So the answer in 8 23/40. Hope this helps!

5 0
3 years ago
Read 2 more answers
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