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Kryger [21]
3 years ago
5

Plz help! Urgent!

Mathematics
1 answer:
kirza4 [7]3 years ago
5 0

Answer:

Both answers are C!!!

Step-by-step explanation:

Im so lucky, I guessed and got them both right on the usatestpreptest.

answer 1: petri dish A will have a density of 19.6

answer 2: Petri dish A by 3.3 bacteria/mm

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Choose the linear inequality that describes the graph. The gray area represents the shaded region.
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The given line has the equation y = 2x - 2, so if the gray area is the one of interest, the inequality is <span>y ≥ 2x – 2.</span>
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What is seven less than three times a number.
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Let’s use y as a replacement for a number. You would do 3y-7 since you multiply by three and take away seven.
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How many tens make 20+60?
aleksley [76]

Answer:

8

Step-by-step explanation:

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4 years ago
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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
PLEASE ANSWER I NEED HELP NUMBER 5.!!!!!!
omeli [17]

Answer:

d \geq 27

Step-by-step explanation:

d + 18\geq  45 subtract 18 from both sides

d \geq 27

3 0
3 years ago
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