You plant 30 african violet seeds and 9 of them sprout. use experimented probability to predict how many will sprout if you plant 20 seeds?

Given that out of 30 planted seeds only 9 of the m sprouted, then:

Experimental probability =(number of occurrence of event)/(total number of trials made)

=9/30

=3/10

thus the number of seeds that will sprout given that 20 seeds we planted will be:

3/10×20

=6 seeds

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".

b

step-by-step explanation: