cho hai đường tròn (O) và (O') tiếp ngoài tại A . Gọi CD là tiếp tuyến chung ngoài của 2 đường trong . tính số đo góc CAD

If there is no real number solution to the quadratic equation x^2+2x+c=0 what is a possible value of c? 1 -2 0 3

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?