need a complete accurate answers

Written Home$ork 3 Math 12:a Scction 1,9,13,23 Due 9/4/14 Beginning ofClass Work on separate Shcct ofPapcr.

l. Supposc an oil spill covers a circular area and that the radius increases accor'ding to tr

/1a)=,++.,i \r here . represents the numbcl ofminutes since the spill was li st obscn,ed. The radius is !l

rncr.urcd tn rnchc. cnd rhe arca.rl'd (ircl( iq gr\cn hy 1=.r/'

A. Wlat was the radius ofthe spill \\.hen it uas lirst observcd? B. Find the functjon: l(/(r)). C. Use your answer 10 pafi B to lind thc cxact time when the area ollhe spjll is E lz .

-t)!A'\--l)\ l l. F.nd ]:]: :1] j] lor ct/). - . \irnplit) )ourrnsuer.A/ " 1+l

I' q '=l l.t. Ier ir.rt=l x(\)=: anJ 1,1.,1- lJ''l r'.1 - ' t+5

A. Fin,l / r I II B. Fi J ,(p((), dnd rrsLlumrrn.l"l4rl

,1. Suppose the point (2, -5) is on the graph ot'y =.1(:r) . Find the corresponding point or1 the graphs of cich of rhese rran"lonnction..

A..f = l(-r)+4 e. , = I i. C. r'=3./(-r)\r /

5. I'hc lilc cxpeclancy, l , of a child can be modeled by the flrnction bclow where y is the year of bith in relationslip lo 1990. For example, -v = 0 corrcsponds to 1990.

l)+96.9,1 Z(u)-

t).ul r r l..l

A. Find the value of Z(10) and glve a practicai inlcrprctation.

. B. Usc algebra to find the valuc oI fr(78) and gi\e a praclical interpretation.

,+' ]r o. Find the in\(r.e lunction ol

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