Can someone help me please

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

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

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs