3 years ago

Please help! Add using a number line −2/5 +4/5 = ?

Mathematics

1 answer:

kobusy [5.1K]3 years ago

5 0

$- \frac{2}{5} + \frac{4}{5} = \frac{2}{5}$

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nydimaria [60]

Answer is 0= -2

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8 0

2 years ago

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What is the 72nd term in the term in the arithmetic sequence 3, 9, 15, 21,

boyakko [2]

Answer:

429

Step-by-step explanation:

y=3+6×(n-1)

n=72

y=3+6×(72-1) = 429

7 0

3 years ago

-x-6=3<br> How do u do this

Hatshy [7]

Answer:

x= -9......................

3 0

3 years ago

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What is the correct answer?

Svetlanka [38]

Answer:

Terms must have the same variable (letter) and the same exponent (little number)

(7x² +3y+ 5) +(9x²+11y- 2)

Opening bracket

7x²+3y+5+9x²+11y-2

keeping like terms together

7x²+9x²+3y+11y+5-2

Since terms having same variable and exponent can be subtracted, added,divided and multiplied

Solving like terms we get

<u>16x²+14y+3</u> which is a correct answer.

4 0

2 years ago

What is the relationship between the variance and standard deviation? variance is the positive square root of the standard devia

lana [24]

Variance of a continuous random variable X is defined as

$\int\limits_D {(x-\mu)^2f(x)} \, dx$

Standard deviation is defined as

$\sigma = \sqrt{Var(X)}$

Hence standard deviation is the positive square root of variance.

6 0

3 years ago