Which of the following are identities? check all that apply. a. cos(x + y) + cos(x - y) = 2009 xcosy o b. cos(x + y) - cos(x - y) = 2 coexcosy c. sin(x + y) + sin(x - y) = 2cosxsiny d. tar(x - 25) = tan x

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample

Anita has a success rate of 80% on free throws in basketball. she wants to know the estimated probability that she can make exactly four of five free throws in her next game. how can she simulate this scenario? categorize each simulation of this scenario as correct or incorrect.