Bethany can mow her family's lawn in 4 hours. her brother colin can mow the lawn in 3 hours. which equation can be used
to find the number of hours, x, it would take for bethany and colin to mow the lawn together?
a) 3+4= x
b) 1/4 x- 1/3x =1
c) 1/4x+1/3x=1
d) 4-3= x

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?