A rectangle has dimensions x and x + 5. Determine the value of x that gives the rectangle an area of 36 cm^2. a) 9
b) 4
c) 6
d) none of these

none of these i guess

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

can someone answer this question plz

step-by-step explanation: