A local dentist wants to know how many adults in a town receive regular cleanings. The dentist surveys 120 random adults living in the town and found 84 people receive regular cleanings. If there are 8,500 adults in the town, how many can be expected to receive regular cleanings? plz help quick

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

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: