vanbenit7
21.01.2021 •
Mathematics
Joanne is buying a pair of shoes in Europe..
The length of her foot is 27.5 cm.
Joanne uses these rules to work out her European shoe size.
length in cm
+2.5
length in inches
length of foot
in inches
x 3
+8
European shoe
size
Joanne thinks her European shoe size is 38
Is Joanne correct?
Show why you think this.
Solved
Show answers
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Ответ:
Use the quadratic formula:-
x = [ -1 +/- sqrt(1^2 - 4*5*-2)] / 2*5
= -1 +/- sqrt 41 / 10
= -0.1 + 0.64 , -0.1 - 0.64
= 0.54, -0.74 Answer