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4 years ago

Can someone please help me??

Mathematics

2 answers:

Bogdan [553]4 years ago

6 0

There will be 6 stamps at Week 8 because the pattern is the stamp will increase 2 stamps then decrease 1 stamp consecutively.

nadezda [96]4 years ago

3 0

6 stamps, because he gets 1 extra stamp on even weeks.

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$\bf \begin{array}{cccllll} \stackrel{\textit{point (0,-7)}}{-7=a(0)^2+b(0)+c}& \stackrel{point (7,-14)}{-14=a(7)^2+b(7)+c}& \stackrel{point (-3,-19)}{-19=a(-3)^2+b(-3)+c}\\\\ -7=c&-14=49a+7b+c&-19=9a-3b+c \end{array}$

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$\bf -14=49a+7b-7\implies -7=49a+7b\implies -7-49a=7b \\\\\\ \cfrac{-7-49a}{7}=b\implies \cfrac{-7}{7}-\cfrac{49a}{7}=b\implies -1-7a=b$

well, now let's plug that "b" into our 3rd equation and solve for "a".

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