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3 years ago

Write √ 45 + √ 20 in the form k √ 5

Mathematics

2 answers:

prohojiy [21]3 years ago

3 0

Answer:

5sqrt(5)

Step-by-step explanation:

sqrt(45)+sqrt(20)

sqrt(9*5)+sqrt(4*5)

sqrt(9)sqrt(5)+sqrt(4)sqrt(5)

3sqrt(5)+2sqrt(5)

(3+2)sqrt(5)

5sqrt(5)

BabaBlast [244]3 years ago

3 0

√45 = √9×5 = 3√5

√20 = √4×5 = 2√5

____________________

√45 + √20 ===》 3√5 + 2√5 = 5√5

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What does two of power of five stand for?

Mars2501 [29]

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3 years ago

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Simplify algebraic equation x^2-4/x^2+2x

hram777 [196]

Answer:

Simplification of algebric expression is $\frac{x^{2} - 2x^{3}-4 }{x^{2} }$

Step-by-step explanation:

Simplify any algebric expression means to write an equivalent expression in which all similar terms combined and remove all symbols such as brackets.

The given algebraic equation is $x^{2} -\frac{4}{x^{2} } +2x$

now for simplifying it

First of all take L.C.M of $x^{2}$

= $\frac{x^{2} (x^{2}) -4 + 2x(x^{2} )}{x^{2} }$

We get $\frac{x^{2} -4+2x^{3}}{x^{2} }$

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Simplification of algebric expression is $\frac{x^{2} - 2x^{3}-4 }{x^{2} }$

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3 years ago

63° 55°<br> X =<br> degrees.

lorasvet [3.4K]

Answer:

Step-by-step explanation:

The sum of these angles must equal 360 degrees.

x+63+55=360

x+118=360

x=242

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3 years ago

How do I solve this? Thank you!

Marat540 [252]

Probably A but not sure

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3 years ago

a sociologist develops a test to measure attitudes towards public transportation and 27 randomly selected subjects are given the

horsena [70]

Answer:

The 95% confidence interval for the mean score is:

$\mu$ ∈ $(67.73,\ \ 84.67)$

Step-by-step explanation:

We want to estimate the population mean, that is, the average score of all the subjects.

An estimator for the population mean μ is ${\overline {x}}$

Since the sample size is $27$ then we use the statistic $t_{\frac{\alpha}{2}}$ with $27-1 = 26$ degrees of freedom

The confidence interval for the mean is:

$({\displaystyle {\overline {x}}} + t_{\frac{\alpha}{2}}\frac{S}{\sqrt{n}},\ \ {\displaystyle {\overline {x}}} - t_{\frac{\alpha}{2}}\frac{S}{\sqrt{n}})$