For sams birthday party , the class order cupcakes. 65% of the cupcakes were frosted. if 13 cupcakes were frosted , how many cupcakes were ordered

Step-by-step explanation:

first it is gonna be less than 13 since 65 is greater than 35. unit rate is 5/13 since 65 divided by 5 is 13. So 5 times 7 is 35. So 20 is the answer.

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