bellam302
31.01.2020 •
Mathematics
If the original cost of a tv is 1250.00 but decreases by 4.5% each week, how many weeks before the tv will cost 800.00?
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Ответ:
F=Ir^t, F=final value, I=initial value, r=rate, t=time, in this case I=1250 and r=(1-.045)=0.955 so
F=1250(.955)^t and we want to find t for when F=800
800=1250(.955)^t
.64=.955^t take the natural log of both sides...
ln.64=t ln.955
t=(ln.64)/ln.995
t≈9.69 weeks
t≈9.69 weeks (to nearest hundredth of a week)
Ответ:
126
Step-by-step explanation:
since b is 54 just subtract 54 from 180 to get a as they are in a sttaight line