3x+15^2+10= -2
3x+225+10= -2
3x+235= -2
Divide both sides by 3
x+235=0.67
Subtract 235 from both sides
x= -234.33
Sorry, in advance, if I did it wrong.
Answer: 
Step-by-step explanation:
To solve this problem you must apply the proccedure shown below;
- Make the equation equal to zero:
-Add 49 at both sides:
- Now, you must take the square root of both sides of the equation, then you obtain the following roots:
- Then you have:
We can just add all these numbers together because they are just addition and subtraction.
We assume the miner starts at 0 (the surface).
0 - 1200 (down) + 900 (up) - 350 (down) = -650 (C)
The first thing you should do for this case is find the amount that Michael has traveled.
For this we have to multiply the distance to the store and the percentage traveled.
We have then:
(3/8) * (4/5) = 12/40
Simplifying we have:
(12/40) * ((1/2) / (1/2)) = (6/20) * ((1/2) / (1/2)) = 3/10
answer
Michael has walked 3 / 10Km (80% of the way to the store)
