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2 years ago

HELP ASAP PLSPLSPLSPLSPLSPLSPLSPLSPLSPLSPLSPLSPLSPLSPLS

Mathematics

1 answer:

maria [59]2 years ago

8 0

Answer: 12 h ; 45 m

Step-by-step explanation:

*Important: From what I can see in this image, this appears to be a test. If this is the case, please do not cheat. In any case, here is the explanation.

What we know:

Progress has been made to 4.75
Rate of digging is 3/5 mph
Depth must be at least 12 1/2
We need to find the minimum amount of time the machine works

How to solve:

By setting up an algebraic equation, we can solve this.

Process:

Set up equation 4.75 + 3/5x = 12 1/2
Convert 19/4 + 3/5x = 12 1/2

95/20 + 12/20x = 250/20

Subtract -95/20 -95/20

12/20x= 155/20

Isolate x via division /(12/20) /(12/20)
+Simplify

x= 12 11/20

Convert 12 h 33 m

Solution: 12 ; 45

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