Answer:
0.2301 = 23.01% probability that exactly 2 don't grow.
Step-by-step explanation:
For each seed planted, there are only two possible outcomes. Either it grows into a healthy plant, or it does not. The probability of a seed growing into a healthy plant is independent of any other seed, which means that the binomial probability distribution is used to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

In which
is the number of different combinations of x objects from a set of n elements, given by the following formula.

And p is the probability of X happening.
90% chance of growing into a healthy plant.
This means that 
12 seeds are planted
This means that 
What is the probability that exactly 2 don't grow?
So 12 - 2 = 10 grow, which is
. Then


0.2301 = 23.01% probability that exactly 2 don't grow.
11 would be my best guess, kinda confusing question. I hope I helped!
Answer:
1,542,682 cm^3.
Step-by-step explanation:
The scale factor = √169:√289
= 13:17
So the Volume ratio is 13^3:17^3
So the volume of the larger solid is 689,858 * (17^3/13^3)
= 1,542,682 cm^3.
Answer:
so just successive powers of 2
Step-by-step explanation:
1, 3, 7, 15, 31, 63, _? Add successive powers of 2 to the number: 1+2=3; 3+4=7; 7+8=15; 15+16=31; 31+32=63; 63+64=127.