Answer:
16.78% probability that exactly 12 of them use their smartphones in meetings or classes.
Step-by-step explanation:
For each adult, there are only two possible outcomes. Either they use their smartphone in meetings or classes, or they do not. The probability of a person using their phone in meetings or classes is independent of any other person. So we use the binomial probability distribution 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.
64% use them in meetings or classes.
This means that 
20 adult smartphone users are randomly selected
This means that 
Probability that exactly 12 of them use their smartphones in meetings or classes.
This is P(X = 12).
16.78% probability that exactly 12 of them use their smartphones in meetings or classes.
We are given all three angles here:
Angle A =68 degrees
Angle B =90 degrees
Angle C =22 degrees.
Now let us calculate :
sin (A) = sin (68) = 0.927
cos (B) = cos (90) = 0
sin (B) = sin (90) =1
cos (C) = cos (22) = 0.927
tan (C) = tan(22) =0.4040
So we can see that sin (A) and cos (C) are both equal to 0.927.
So cos (C) is the correct option.
The y-intercept is (0,4) you can use photomath for problems like this an others
Answer: can we be friends I’m homeless and live at the Krusty Krab
Step-by-step explanation:
Sin of an angle=opposite side/hypotenuese
cos of an angle=adjacent side/ hypotenuese
tan of an angle=opposite side / adjacent side
11. sine M=7/25 12. do the same but using the number of this triangle
cos M=24/25
tan M=7/24
14. They give you the angle 35 degrees. So that will be what you start with. Look at the lengths of the sides given. Where are they located in respect to the angle 35. 20 is the hypoteneuse, and x is opposite of 35. So the equation that uses hypoteneuse and opposite is sin.
sin 35=35/x, punch in sin 35 into the calculator. then you would get .57=35/x. The cross multiply .57x=35=61.40.
Now you can repeat for the rest of the problems. I hope this is helpful.
