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mars1129 [50]
3 years ago
11

What is the variable in this expression? 9x + 5

Mathematics
1 answer:
Lilit [14]3 years ago
6 0
Variables are any letter that holds the value of a number. In most cases it is x or y. It can sometimes be sound next to another number. In this case you can find x next to 9. The variable here is x.
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The population of the US doubles every 35 years. In 1940 the US population was 75 million. What is the current population
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about 260 million

Step-by-step explanation:

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8× what =2
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8*1/4= 2

A) 0.071

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Given that sinΘ = 1/2 and that Θ lies in quadrant II, determine the value of cosΘ.
amm1812

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el perimetro de un terreno rectangular es de 170m y su area es de 170^2hallar la medida de sus lados con ecuacion cuadratica
Blizzard [7]

Answer:

Acá tenemos un sistema de ecuaciones.

El perímetro de un rectángulo es:

2*A + 2*L = 170m

donde A es el ancho y L es el largo.

Y el área del rectángulo es:

A*L = 170m^2.

Entonces, el primer paso es aislar una de las variables en una de las ecuaciones, yo voy a aislar A en la segunda:

A = 170m^2/L.

Ahora reemplazo eso en la primera ecuación y la resuelvo para L.

2*( 170m^2/L.) + 2*L = 170m.

340m^2 + 2*L^2 = 170m*L

ahora tenemos una ecuación cuadrática:

2*L^2 - 170m*L + 340m^2 = 0.

Las soluciones se pueden obtener usando la formula de Bhaskara:

L = \frac{+170 +- \sqrt{170^2 -4*340*2}  }{2*2} = \frac{170 +-161.8}{4}

Entonces las soluciones son:

L = (170 + 161.8)/4 = 82.95m

L = (170 - 161.8)/4 = 4.1m

Entonces, si tomamos L = 82.95m, tenemos A = 4.1 m

y el área es:

A*L = 4.1m*82.95m = 170m^2

3 0
3 years ago
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