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2 years ago

Write an algebraic expression that represents the sum of 18 and the opposite of a number

Mathematics

2 answers:

ss7ja [257]2 years ago

6 0

Hi, there!

_______

"The sum of" _+_

"the opposite of a number" -s

Putting the parts together

$\sf{18+(-s)}$

But we don't usually leave the answer like that, we write it as:

$\sf{18-s}$

Hope the answer - and explanation - made sense,

happy studying!!

Tema [17]2 years ago

5 0

Answer:

The expression you are looking for is: 18 +x Explanation: The sum of two numbers is the result of adding them. Typically we use a letter like x to stand for a number. So the sum of 18 and a number is 18+ x

Step-by-step explanation:

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2 years ago

Samuel tiene 11 cajas con mosaico cuadrado de 20 cm por lado y quiere cubrir una pared que mide 3 cm y de largo 2 cm de alto.Si

kirza4 [7]

Answer: Samuel no necesita comprar mas cajas.

Step-by-step explanation:

Cada mosaico es un cuadrado de 20cm por lado.

Entonces el área de cada mosaico es:

A = 20cm*20cm = 400cm^2.

En una caja hay 14 mosaicos, entonces cada caja puede cubrir:

14*400cm^2 = 5,600cm^2.

Ahora, el problema dice que la pared mide 3cm por 2 cm.

En ese caso, con un solo mosaico cubrirías la pared, entonces supongo que esta mal escrito.

Las dimensiones de la pared serian 3 metros por 2 metros.

1 m = 100cm

Entonces la pared es 300cm por 200cm.

El área total de la pared seria:

300cm*200cm = 60,000cm^2.

Ahora, cada caja de mosaicos cubre 5,600 cm^2.

Entonces el numero de cajas necesarias para cubrir toda la pared es:

(60,000cm^2)/(5,600cm^2) = 10.7

Entonces se necesitan 10.7 cajas para cubrir esa pared, y Samuel tiene 11, entonces el no necesita comprar mas cajas.

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3 years ago

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Step-by-step explanation:

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Answer:

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