Help me with this asap

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

On new year's day, the average temperature of a city is 5.7 degrees celsius. but for new year's day 2012, the temperature was 9.8 degrees below the average. i) if a represents the average temperature on new year's day and 7 represents the temperature on new year's day 2012, what formula accurately relates the two values together? ii) what was the temperature on new year's day 2012? dt a 0.8 ii) - 4 1 degrees celsius da-t-98 ii) 59 degrees celsius 1) 7 = -9,8 11) 59 degrees celsius ii) l degrees celsius

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?