The quantities X and Y are proportional. Find the constant of proportionality (r)in the equation Y=RX.

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

An apartment has a replacement cost of $950,000 and contents valued at $1,450,000. it has a classification of a and a territory rating of 3. find the annual premium a) $10,185 b) $9,230 c) $3,155 d) $13,830