There are 85 boys and 94 girls in the senior class. if there are 1135 students in high school, about how many boys could we expect to have in grades 11-12?

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

Calculate the effective quarterly compound interest rate equivalent to a 1% of monthly compound interest rate.

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?