3 years ago

A solid has 20 vertices and 30

Mathematics

1 answer:

Gnesinka [82]3 years ago

5 0

Answer: it’s 12

Step-by-step explanation:

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The sum of two numbers is thirteen, and the sum of<br> their squares is 89. Find the two number

Murljashka [212]

Answer:

$Suppose~that~the~two~numbers~are~x~and~y.\\According~to~question,\\Sum~of~the~numbers = 13\\or, x+y=13........(1)\\or, y = 13-x.......(2)\\Again,\\Sum~of~their~squares=89\\or, x^2+y^2=89\\or, (x+y)^2-2xy=89\\From~eq^n(1)~and~(2),\\13^2-2x(13-x)=89\\or, 169-26x+2x^2=89\\or, 2x^2-26x+169-89=0\\or, 2x^2-26x+80=0\\or, x^2-13x+40=0\\or, x^2-8x-5x+40=0\\or, x(x-8)-5(x-8)=0\\or, (x-5)(x-8)=0\\i.e. x=5~or~8\\When~x=5,~y=13-x=13-5=8\\When~x=8,~y=13-x=13-8=5\\So,~the~two~numbers~are~5~and~8.$

8 0

3 years ago

The length of a cell phone is 8 centimeters to the

igor_vitrenko [27]

Answer:

81 mm is more precise

Step-by-step explanation:

millimeters are smaller than cm

8 cm * 10 mm/1 cm = 80 mm

compared to 81 mm

81 mm is more precise

6 0

3 years ago

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Find the coordinates of the point on the curve y = 2x² - x - 1 at which the gradient is 7

madreJ [45]

Answer:

See below

Step-by-step explanation:

The derivative of the function is the slope

2x^2 - x -1 take derivative ( f ' )

4x -1 equate to 7

7 = 4x -1

x = 2 sub into the original equation to find y = 5

5 0

2 years ago

What is the inverse of x+1/x-2

Thepotemich [5.8K]

X-2/x+1 i think i’m not sure of that

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2 years ago

Distribute 2x (6x+2)

boyakko [2]

Answer:

12x^2 +4x

Step-by-step explanation:

2x (6x+2)

Multiply 2x by each term in the parentheses

2x*6x + 2x*2

12x^2 +4x

6 0

3 years ago