Calcule a porcentagem.
a)3 em cada 10 alunos estudam matematica todos os dias.
b)3 em cada 8 torcedores capixabas sao flamenguistas.
c)32 em cada 50 pessoas entrevistadas assistem a novelas
d)17em cada 20 alunos tem celular.

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

Abowl contained 270 starbursts of all different colors. if the probability of picking a yellow is 1/9, then how many yellow starbursts are in the bowl ? ?

What is the perimeter of a rectangle if the length is 5 and the width is x?