If a seed is planted, it has a 80% chance of growing into a healthy plant. If 7 seeds are planted, what is the probability that exactly 4 don't grow

The probability that exactly 4 don't grow is P=0.0287.

Step-by-step explanation:

This random variable can be modeled with a binomial distribution.

The sample size is n=7, the total amount of seeds planted.

The probability of success is p=0.8.

The probability that k seeds grow in the sample is:

If exactly 4 don't grow, this means that exactly 7-4=3 seeds grow.

Then, we have to calculate P(x=3):

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.