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A kiosk on Brighton pier sells ice-creams. Daily sales may be modelled by the function S(t,r)=5(t-6.5)(40-r) where t denotes maximum daily temperature in C and
A kiosk on Brighton pier sells ice-creams. Daily sales may be modelled by the function
S(t,r)=5(t-6.5)(40-r)
where t denotes maximum daily temperature in C and r denotes daily rainfall in mm.
(a) How many ice-creams are sold on a day when it is 22C and there is 4 mm of rain?
(b) Use the small increments formula to estimate the change in sales due to a 1.5C rise in temperature and a 1 mm increase in rainfall from the levels in part (a)
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