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UkoKoshka [18]
2 years ago
5

Mr. Hamell had to pay an electrician to fix something in his home. He charged a service fee of $90 to come look at the problem,

and then charged $25 per hour to fix it. If the total was $165, how many hours did he work?​
Mathematics
1 answer:
Inga [223]2 years ago
4 0

Answer: 3

165 - 90 = 75, 75/25 = 3

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Based on the line of best fit, the length of this catfish can be predicted to be 38 inches.

<u>Given the following data:</u>

  • Weight of catfish, x = 40 pounds.

<h3>What is a line of best fit?</h3>

A line of best fit is also referred to as a trend line and it can be defined as a statistical (analytical) tool that is used in conjunction with a scatter plot, in order to determine whether or not there's any correlation between a data.

From the graph of the data, we have the following linear equation:

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Substituting the value of x, we have:

y=(\frac{1}{2} \times 40 )+18\\\\y=20+18

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Elena-2011 [213]

Resolviendo un sistema de ecuaciones veremos que se vendieron 900 boletos de $15 y 3600 boletos de $10.

<h3> ¿Cuántos boletos de cada tipo se vendieron?</h3>

Primero definamos las variables:

  • x = número de bolteos de $10 vendidos.
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Sabemos que se vendieron 4500 boletos, entonces:

x + y = 4500

Y se recaudo un total de $49,500, entonces:

x*$10 + y*$15 = $49,500

Entonces tenemos un sistema de ecuaciones:

Para resolver esto, primero debemos aislar una de las variables en la primer ecuación, voy a aislar x:

x = 4500 - y

Ahora reemplazamos esto en la otra ecuación:

(4,500 - y)*$10 + y*$15 = $49,500

Ahora debemos resolver estoy para y.

$45,000 - y*$10 + y*$15 = $49,500

y*$5 = $49,500 - $45,000 = $4,500

y = ( $4,500)/$5 = 900

Entonces:

x = 4500 - 900 = 3600

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Sí quieres aprender más sobre sistemas de ecuaciones:

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#SPJ1

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Answer:

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2      b

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1b

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I assume you mean divide using the conjugate to rationalize the denominator and express the result in standard rectangular form.

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Answer:

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