The time that a butterfly lives after emerging from its chrysalis can be modelled by a random variable t, the model here taking the probability that a butterfly survives for more than t days as p(t> t)=36(6+t)2, t≥0. for these problems, ensure your answers are accurate to within 3 decimals. part a) what is the probability that a butterfly will die within 6 days of emerging? 0.75 part b) if a large number of butterflies emerge on the same day, after how many days would you expect only 6 % to be alive? 18.494 part c) calculate the mean lifetime of a butterfly after emerging from its chrysalis?

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".