Which of the following is an indicator of good water quality? a. ph lower than 5.0 b. high levels of fecal coliform c. high levels of dissolved oxygen d. all of the above

The answer would be: c. High levels of dissolved oxygen

Oxygen is vital for most (aerobic) organism. Fish using oxygen that dissolved in the water so high level of dissolved oxygen will make the fish grow easier. Water with pH of 5 would be an acid water. Acid is corrosive and it can kill some organism that sensitive. High levels of fecal coliform mean the water contaminated with fecal material and must have a high level of bacteria.

Distance^2= yellow line ^2 (see picture) = 30^2 + 49^2so distance = squareroot of (300^2 +49^2)i dont know if this is how to solve it, but i cnt think of another way

The answer is 12, for the points