If line r and line s are parallel and ∠2 measures 45°, what is the measure of ∠3?

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

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

One file clerk can file 10 folders per minute. a second file clerk can file 11 folders per minute. how many minutes would the two clerks together take to file 672 folders?