Bob is given some key items from a regression analysis. the regression equation (i. e., fitted line) is (monthly irrigation spent per acre) = 20 - .5 * (monthly rainfall in inches). the r^2 in this same analysis is .99. using this equation to predict an outcome, what monthly irrigation spending could bob expect if it there was no rain in a given month? (a) $10/acre (b) $16/acre (c) $18/acre (d) $20/acre

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.