250 people went to a “couples only” party at 9pm. 70 people left at 11pm, how many couples stayed at the party?

In an improper fraction, is the numerator equal to, less than, or greater than the denominator

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

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