Enny is cooking a chicken for dinner. a chicken needs be cooked for 40 minutes per kilogram, plus an extra 20 minutes. how long will it take to cook a chicken weighing 3 kilograms

140 minutes (2 hours and 20 minutes)

Step-by-step explanation:

The expression would be:

Let x = kilograms

40x + 20

substitute our value in:

40(3) + 20

120 + 20

140 minutes

140

Step-by-step explanation:

First you put it into an equation (40x + 20=?)

Plug in what you know, in this case x=3.

40(3) + 20= ?

Now solve.

40 times 3 equals 120. 120 plus 20 equals 140.

40(3) + 20= 140

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