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3 years ago

15

A mechanic charges $55 an hour for an oil change and spends $45 a day on supplies. Which expression represents the amount the me

chanic earns in one day?

1 answer:

san4es73 [151]3 years ago

5 0

Answer:

55x-45=y

Step-by-step explanation:

in terms of algeabra 55 dollars per hour x amount of hours 45 spent so subtract 45; y is the amount per day. The variables can be swapped

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Need help with math homework

Pavel [41]

Hello!

The answer for A is:

$X1=-1\\X2=5$

The answer for B is: The rocket will hit the lake surface in 5 seconds.

<h2>Why?</h2>

Defining the terms:

$a=-16\\b=64\\c=80\\$

So, replacing it in the quadratic equation (it's given to you in the exercise)\\

$x=\frac{-b+-\sqrt{b^{2}-4*a*c } }{2*a}$

$x=\frac{-64+-\sqrt{64^{2}-4*-16*80 } }{2*-16}$

$x=\frac{-64+-\sqrt{64^{2}+5120} }{-32}=\frac{-64+-\sqrt{4096+5120} }{-32}\\x=\frac{-64+-\sqrt{9216} }{-32}=\frac{-64+-\ 96 }{-32}\\x=\frac{-64+-\ 96 }{-32}\\x1=\frac{-64+\ 96 }{-32}=\frac{32}{-32} =-1\\\\x1=\frac{-64-\ 96 }{-32}=\frac{-160}{-32} =5\\$

We are working with a quadratic equation, so we will have two possible results,

$X1=-1\\X2=5\\$

Now, we are asked to find the time, time can not be a negative value, we have to discard X1 (-1) since it's a negative value, knowing that, the rocket will hit the lake after 5 seconds.

Have a nice day!

5 0

4 years ago

Please help me with this question

boyakko [2]

Answer:

0.7999989281

Step-by-step explanation:

x1 = cos^-1 (3/5)

x1= 53.13°

sin(53.13) = 0.7999989281

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3 years ago

Thevalley was at least 4 feet below sea level Inequality? PLEASE HELP DUE TODAY!!!!

alukav5142 [94]

X less than or equal to -4

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3 years ago

Find the measures of 1 and 2

juin [17]

Answer:

1 ) ∠1 = 105 ∠2 = 75

2) ∠1 = 50 ∠2 = 50

Step-by-step explanation:

4 0

3 years ago

7x + 3 (3x+6) = 194 what is the answer

balandron [24]

Answer:

x = 11

Step-by-step explanation:

7x + 3(3x + 6) = 194

<em>open the parenthesis</em>

7x + 3 * 3x + 3 * 6 = 194

7x + 9x + 18 = 194

<em>subtract 18 from both sides of the equation</em>

7x + 9x + 18 - 18 = 194 - 18

<em>combine like terms</em>

7x + 9x = 194 - 18

16x = 176

<em>divide both sides of the equation by 16</em>

16x/16 = 176/16

x = 176/16

x = 11

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3 years ago