The formula c=fλ relates the speed (c),frequency (f), and the wave (λ) of light. choose from the drop down lists to complete the sentence. given c & f-

λ= c/f

λ=f/c

λ=c+f
given c and λ-
f=c/λ
f=c+ λ
f= λ/c

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

With finding limits of multi variable !