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vampirchik [111]
3 years ago
9

Brenda observes the the keyboard and the screen of an open laptop lie on two different places in how many lines do the planes co

ntaining the keyboard and screen intersect
Mathematics
1 answer:
Margarita [4]3 years ago
5 0
The keyboard and screen intersect in just one line.

The intersection of 2 different planes is always a straight line. Imagine where the screen and the keyboard meet. It is a horizontal line from left to right as you are looking at the middle of your laptop.
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Solve this pair of simultaneous equations.<br> 5x + 2y = 20<br> x + 4y = 13<br> X=<br> y=
Katena32 [7]

Answer:

y= 2.5

x= 3

Step-by-step explanation:

multiply eqn 2 by 5

5x +20y =65

eqn 2 -1

20-2)y=65-20

18y=45

y=2.5

x+4×2.5 =13

x+10=13

x=3

8 0
3 years ago
Read 2 more answers
The top and bottom margins of a poster 6 cm each, and the side margins are 4 cm each. If the area of the printed material on the
Serga [27]

Answer:

p = 25,20 cm

h = 34,32 cm

A(min) = 864,86 cm²

Step-by-step explanation:

Let call p and h dimensions of a poster, ( length , and height respectively) and x and y  dimensions of the printed area of the poster then

p = x + 8        and      h = y + 12

Printed area = A(p) = 384 cm²     and   A(p) = x*y     ⇒ y = A(p)/x

y = 384 / x

Poster area  =  A(t) = ( x + 8 ) * ( y + 12 ) ⇒ A(t) =  ( x + 8 ) * [( 384/x ) + 12 ]

A(t)  =  384 + 12x + 3072/x + 96      A(t) = 480 + 3072/x + 12x

A(t)  =  [480x + 12x² + 3072 ] / x

A´(t) =  [(480 + 24x )* x  - (480x + 12x² + 3072]/x²

A´(t) =  0         [(480 + 24x )* x  - 480x - 12x² - 3072] =0

480x + 24x² -480x -12x² - 3072 = 0

12x² = 3072         x² = 296

x = 17,20 cm       and      y =  384/17,20      y = 22,32 cm

Notice  if you substitu the value of x = 17,20 in A(t) ; A(t) >0 so we have a minimun at that point

Then dimensions of the poster

p = 17,20 + 8  = 25,20 cm

h = 22.32 + 12 =34,32 cm

A(min) = 25,20 *34.32  

A(min) = 864,86 cm²

7 0
3 years ago
Mai camino de un sendero de 30 millas. ¿Cuántas millas caminó? Explica o muestra tu razonamiento.​
Ksivusya [100]

Answer:

Sorry though i dont know how to speak Spanish

5 0
3 years ago
A parking space is 20 feet long. A pickup truck is 6 yards long. How many inches longer is the parking space than the truck
masya89 [10]

1 yard = 3 feet.

Multiply the length of the truck by 3 to get total feet:

6 x 3 = 18 feet.

Subtract the length of the truck from the length of the parking space:

20 - 18 = 2 feet

1 foot = 12 inches.

Multiply 2 feet by 12:

2 x 12 = 24 inches longer.

7 0
3 years ago
How to do improper fractions with 3.8 repeating
vivado [14]
3.88888=3.88888/1=38.8888888

so lets ssay our repeating decimal = a fraction x
x=3.888 is true
multiply by 10
10x=38.8888
now subtract fir frist eqation from second
10x-x=38.8888-3.888888
9x=35
divide both sides by 9
x=35/9
x=3 and 7/9

anser is 3.88=3 and 7/9

3 0
3 years ago
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