2/13 Exercise 13.04 Jaa Sulje Kirjaudu sisään lähettääksesi tämän lomakkeen There is a proportionality between [[$ a $]], [[$ b $]], [[$ c $]] and [[$ d $]], which can be marked as [[$ \displaystyle\frac {a} {b} = \displaystyle\frac {c} {d} $]]. a) What kind of proportionality exists between [[$ a $]] and [[$ c $]]? [[$ a $]] and [[$ c $]] are directly inversely proportional. b) What kind of proportionality exists between [[$ b $]] and [[$ c $]]? [[$ b $]] and [[$ c $]] are directly inversely proportional. Kirjaudu sisään lähettääksesi tämän lomakkeen