A hilly watershed has a basin area of 269 km2, in which elevation ranges from 311 m to 1600 m. Precipitation data is collected at 6 gauge locations. Using the information below, compute mean annual precipitation using: (i) an arithmetic mean

(ii) Thiessen polygons

(iii) the hypsometric method

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.