There were 200 participants in a concert. there were 4 times as many girls as boys. a. how many girls were there ? b. how many more girls than boys were there?

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Lee has $1.75 in dimes and nickels. the number of nickels is 11 more than the number of dimes. how many of each coin does he have?