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3 years ago

What is the sum of -5/7 + 4/7?

Mathematics

2 answers:

LekaFEV [45]3 years ago

8 0

Answer:

1/7

Step-by-step explanation:

Brilliant_brown [7]3 years ago

4 0

Answer: -1/7

Step-by-step explanation: Since the fractions have the same denominator you can add them together without trying to have to change it

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Simplify 2√2-√3<br> ---------------<br> √2+√3

serious [3.7K]

Step-by-step explanation:

$= \frac{2 \sqrt{2} - \sqrt{3} }{ \sqrt{2} + \sqrt{3} }$

$= \frac{2 \sqrt{2} - \sqrt{3} }{ \sqrt{2} + \sqrt{3} } \times \frac{ \sqrt{2} - \sqrt{3} }{ \sqrt{2} - \sqrt{3} }$

$= \frac{ 2( \sqrt{2} - \sqrt{3} )( \sqrt{2} - \sqrt{3} )}{ { \sqrt{2} }^{2} - { \sqrt{3} }^{2} }$

$= \frac{2(2 - \sqrt{6} - \sqrt{6} - 3) }{2 - 3}$

$= \frac{2( - 1 - 2 \sqrt{6} )}{ - 1}$

$= \frac{ - 2(1 + 2 \sqrt{6} )}{ - 1}$

$= 2(1 + 2 \sqrt{6} )$

$= 2 + 4 \sqrt{6}$

6 0

1 year ago

7x what gives me 1 can someone answer I'm new

Lelu [443]

Doing (7x÷7) I think equals 1

3 0

3 years ago

Read 2 more answers

Solve the system of equations using substitution:<br> 6x – y = –15<br> X + 2y = 17

defon

Answer:

x = -1

y = 9

Step-by-step explanation:

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3 0

3 years ago

The perimeter of a rectangular swimming pool is 446 centimeters. The width of the pool is 7 centimeters less than the length of

VLD [36.1K]

Answer:

length = 115 cm

width = 108 cm

Step-by-step explanation:

The perimeter of a rectangular swimming pool is 446 centimeters

LEt L be the length of the pool

The width of the pool is 7 centimeters less than the length of the pool.

width = length - 7

W= L-7

Given perimeter = 446

Perimeter of rectangle = 2(length)+2(width)

446 = 2(L) + 2(W) we know W = L-7

446 = 2(L) + 2(L-7)

446 = 2L + 2L - 14

Add 14 on both sides

460 = 4L

divide by 4 on both sides

L= 115

Length L= 115

Width W = L - 7 = 115 - 7= 108

5 0

3 years ago

Read 2 more answers

There are 5 water birds swimming in a pond. If there are 3 ducks and 2 geese at the pond, what fraction of the birds are geese?

Ivan

Answer:

fraction of geese = 2/5

Step-by-step explanation:

To find the fraction of geese, take the number of geese over the total number of birds

fraction of geese = 2/5

6 0

3 years ago

What is the sum of -5/7 + 4/7? ​

What is the sum of -5/7 + 4/7?