Which expression is equivalent to the following expression? 4(3g)+4g Which expression is equivalent to the following expression? s+s+s+s+s+s+t+t+t

Which expression is equivalent to the following expression? 9x-5y+x+x+x+x

Which expression is equivalent to the following expression? 3(3v)+5v

Which expression is equivalent to the following expression? 9k+9m-k-k-k-k

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x

9/10 divide by -3/15 as a mixed number

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.