All categories

4 years ago

Is 1+3√15 rational number and why

Mathematics

2 answers:

Vitek1552 [10]4 years ago

5 0

Irrational because square root of 15 is irrational

denis23 [38]4 years ago

5 0

I think 12.6189
because 3√15=11.6189
11.6189+1=12.6189

You might be interested in

2/3 of a class are girls. A) what is the ratio girls to boys in the class? B) what is the ratio boys to girls in the class

tekilochka [14]

a) 2:1

b) 1:2

2/3 are girls so 1/3 are boys

5 0

3 years ago

Find LCM of: x2 - 9, 3x3 + 81

VikaD [51]

Answer:

$\boxed{\pink{\sf (x + 3) \ is\ the \ LCM . }}$

Step-by-step explanation:

Given two expressions ,

$\qquad (1)\: x^2 - 9 \\\\ \qquad (2)\:3x^3 + 81$

And , we need to find the LCM , that is lowest common factor . So , let's factorise them seperately .

Factorising x² - 9 :- 

$= x^2 - 9 \\\\= x^2 - 3^2 \\\\ \red{= (x+3)(x-3)} \qquad\bf [Using \ a^2-b^2 = (a+b)(a-b) ]$

Factorising 3x³ + 81 

$= 3x^3 + 81\\\\= 3(x^3+27) \\\\= 3( x^3+27) \\\\ = 3(x^3+3^3) \\\\ \red{= 3 [ (x+3)(x^2+9-3x) ] } \qquad \bf{[ Using \ a^3+b^3=(a+b)(a^2+b^2-ab) ] }$

Hence we can see that (x+3) is common factor in both expressions.

Hence the LCM is ( x+3 ) .

8 0

3 years ago

Work out the volume of a sphere please help i’ll give u brainlest

Doss [256]

Answer:

V = 3591.4 cm³

Step-by-step explanation:

Volume of Sphere = $\frac{4}{3} \pi r^3$

Where r = 9.5 cm

V = $\frac{4}{3} (3.14)(9.5)^3$

V = $\frac{4}{3} (3.14)(857.4)$

V = $\frac{10774}{3}$

V = 3591.4 cm³

7 0

3 years ago

Read 2 more answers

A sweater costs $12 more than a shirt. Together they cost $46. What was the price of the shirt

enyata [817]

Answer:46 by 46 that is how much for two tshirts will cost

8 0

3 years ago

Kim purchases pet insurance for her cat in 2011, she paid $40 per month. She switch to Discount Insurance she bought online for

emmasim [6.3K]

I think it's 15% discount

6 0

4 years ago