Desiree made 100 cookies this week. She baked 3 more than 4 times the total she made last week. How many cookies did she bake last week?

24.25 cookies

Step-by-step explanation:

Amount of cookis she made last week = x

100 = 4x + 3

Subtract 3 from both sides:

97 = 4x

Divid by 4 to isolate x:

24.25 = x

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

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