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wariber [46]
3 years ago
6

Which value of x makes this a true statement (3x+5=2x+10)

Mathematics
1 answer:
Alex787 [66]3 years ago
8 0

Step-by-step explanation:

this is a very simple question.

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Question Help Assume that when adults with smartphones are randomly​ selected, 6464​% use them in meetings or classes. If 2020 a
Vitek1552 [10]

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.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

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

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

64​% use them in meetings or classes.

This means that p = 0.64

20 adult smartphone users are randomly​ selected

This means that n = 20

Probability that exactly 12 of them use their smartphones in meetings or classes.

This is P(X = 12).

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 12) = C_{20,12}.(0.64)^{12}.(0.36)^{8} = 0.1678

16.78% probability that exactly 12 of them use their smartphones in meetings or classes.

5 0
3 years ago
Given ABC, sin (A)=
Alisiya [41]

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.

8 0
3 years ago
Read 2 more answers
What is the value of the y-intercept of the following equation?<br> 6y+4x=24
Lena [83]
The y-intercept is (0,4) you can use photomath for problems like this an others
8 0
4 years ago
Kelsey painted 1/4 of her bedroom in 3/7 of an hour. At this rate, how long would it take her to paint the entire room? (5 point
eimsori [14]

Answer:  can we be friends I’m homeless and live at the Krusty Krab

Step-by-step explanation:

6 0
3 years ago
I don't understand how sine, cosine, and tangent have ANYTHING to do with solving these??
UNO [17]
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.
6 0
3 years ago
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