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Bond [772]
3 years ago
13

Math question pls help

Mathematics
2 answers:
tatuchka [14]3 years ago
6 0

Answer:

9x+12y ≤ 120

Step-by-step explanation:

Oil change takes 9 minutes and the number done is represented by x

Tire change takes 12 minutes and the number done is represented by y

She can work no more than 120 minutes

9x+12y ≤ 120

mash [69]3 years ago
3 0

Answer:

9x+12y≤ 120

Step-by-step explanation:

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The choices are <br> X &lt; -6<br> X &gt; -6<br> X&lt;_ -6<br> X&gt; -6
elena-14-01-66 [18.8K]
  • Starting point of arrow is -6.
  • The arrow is travelling to wards left.
  • I.e the arrow is decreasing and x is decreasing.

Hence the solution is

\\ \tt\hookrightarrow x\in (-\infty,-6]

  • x<=-6
5 0
2 years ago
Read 2 more answers
Atmospheric pressure decreases by about 11.8% for every 1000 meters you climb. The pressure at sea level is 1013 millibars (a un
erica [24]
At sea level, the pressure is 1013, that's when the altitude is at 0, sea level, let's see

\bf \textit{Periodic Exponential Decay}\\\\&#10;A=I(1 - r)^{\frac{t}{p}}\qquad &#10;\begin{cases}&#10;A=\textit{accumulated amount}\to &1013\\&#10;I=\textit{initial amount}\\&#10;r=rate\to 11.8\%\to \frac{11.8}{100}\to &0.118\\&#10;t=\textit{meters climbed}\to &0\\&#10;p=period\to &1000&#10;\end{cases}&#10;\\\\\\&#10;1013=I(1-0.118)^{\frac{0}{1000}}\implies 1013=I\cdot 1\implies 1013=I

so, the inital amount is 1013, when t = 0,

\bf \textit{Periodic Exponential Decay}\\\\&#10;A=I(1- r)^{\frac{t}{p}}\qquad &#10;\begin{cases}&#10;A=\textit{accumulated amount}\\&#10;I=\textit{initial amount}\to &1013\\&#10;r=rate\to 11.8\%\to \frac{11.8}{100}\to &0.118\\&#10;t=\textit{meters climbed}\to &t\\&#10;p=period\to &1000&#10;\end{cases}&#10;\\\\\\&#10;A=1013(1-0.118)^{\frac{t}{1000}}\implies A=1013(0.882)^{\frac{t}{1000}}

now, to check the atmospheric pressure at 4000, simply set t = 4000, to get A.


7 0
3 years ago
keisha estimates 259 + 279 by rounding each number to the nearest 10. what is keisha's estimate of the sum?
kolezko [41]

Answer:

540

Step-by-step explanation:

259 + 279 = 538

Rounded to nearest 10

= 540

6 0
3 years ago
Read 2 more answers
Geometric mean of 5 and 8 in simplest radical form
Montano1993 [528]
First, multiply 5 and 8. That equals 40. Then you take the square root of 40, which doesn't result in a whole number, so you factor 40 and removing perfect squares. In which case the answer would be 2√10
6 0
3 years ago
I need help. u need to answer. i need to see ur answer. u have to answer correctly. JKKK. but i need help :(
ElenaW [278]

Answer:

3x + 100 < 2x - 250

Step-by-step explanation:

The problem said that Keisha's guess was "250 less than twice the number".

It was written as 250-2x, which is actually twice the number less than 250, because we are subtracting 2x. We just need to write it like this:

2x-250

So the inequality should be:

3x + 100 < 2x - 250

5 0
3 years ago
Read 2 more answers
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