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balandron [24]
3 years ago
14

20% of all trucks undergoing a certain inspection will fail the inspection. Assume that 40 trucks are independently undergoing t

his inspection, one at a time. The expected number of trucks who fail the inspection is:
Mathematics
2 answers:
Ulleksa [173]3 years ago
6 0
I need help with this too... 
Help :(
olga2289 [7]3 years ago
3 0
20% of 40 = 8
So 8 trucks are expected to fail the inspection.
Hope it helps!
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PLEASE HELP!
Kitty [74]
You can reword the two equations as:

-5x-y=15 (Divide original value by 3)
-2x+6y=6

Then use elimination to find x:

-30x-6y=90 (Multiply by 6 to get y values to be same to cancel out)
-2x+6y=6

You're left with:

-32x=96. Which can then be solved to find x which is -3.

Then plug back in 

-2x+6y=6

Now to: -2(-3)+6y=6.

Which reduces to 6+6y=6. So y=0.



To graph them, just reword the equations (yes once again) so that y is in front.

y=-5x-15 and y=(1/3)x+1






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Answer to this math problem
Cerrena [4.2K]
Subsitute 1/3 for t

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