Code key: 1=a, 2=b, 3=c, 4=d, 5=e, 6=f, 7=g, 8=h,
9=1, 10=), 11=k, 12=l, 13=m, 14=n, 15=0, 16=p, 17=q,
18=r, 19=s, 20=t, 21=u, 22=v, 23=w, 24=x, 25=y, 26=z
use the code key to break the code of this nine-letter
word: 5 19 16 9 15 14 175
abc

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.