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3 years ago

I need to know what the answer is for this question

Mathematics

2 answers:

True [87]3 years ago

5 0

D. because the temperature drop 2 degrees every hour. from 3 pm to 7 pm was 4 hour i subtract 2 degrees per every hour

Anna35 [415]3 years ago

4 0

3pm to 7pm is 4 hours. 4 hours times 2 degrees dropped every hour is 8 degrees total dropped within those 4 hours. The previous temperature of 4 degrees at 3pm minus the 8 degres dropped is -4.

Answer is D.

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A coin is tossed 8 times. What is the probability of getting all heads? Express your answer as a simplified fraction or a decima

kumpel [21]

Answer:

The probability of getting all heads is $\frac{1}{256}$ .

Step-by-step explanation:

For each time the coin is tossed, there are only two possible outcomes. Either it is heads, or it is not. So we use the binomial probability distribution to solve this problem.

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.

In this problem, we have that:

A coin is tossed 8 times. This means that $n = 8$

In each coin toss, heads or tails are equally as likely. So $p = \frac{1}{2}$

What is the probability of getting all heads?

This is $P(X = 8)$

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

$[tex]P(X = 8) = C_{8,8}*(\frac{1}{2})^{8}*(1 - \frac{1}{2})^{0}$ = $\frac{1}{256}$

The probability of getting all heads is $\frac{1}{256}$ .

7 0

3 years ago

What is double of 3?

____ [38]

It will be 6 because you just add it twice the amount to 3. Therefore, 3 *2=6

8 0

3 years ago

Read 2 more answers

PLEASE I NEED THIS <br> SO MANY POINTS

katovenus [111]

The speed of Sali is 18.75 km/hr.

Given,

Total distance travelled by Jane and Sali =63 km.

The total time is taken by Jane=3.5 hours.

Sali started to cycle 4 minutes after Jane started to cycle $=\frac{4}{60}=\frac{1}{15}$ hours.

<h3>What is the formula to find speed?</h3>

The formula to find speed is $Speed=\frac{Distance}{Time} \ km/hr$ .

The speed of Jane $=\frac{63}{3.5}=18 \ km/hr$ .

Let the speed of Sali be $x \ km/hr$ .

Sali caught up with Jane when they had both cycled 30 km.

Thus, $\frac{30}{18}-\frac{30}{x}=\frac{1}{15}$

$\implies \ \frac{30x-540}{18x} =\frac{1}{15}$

$\implies \ 15(30x-540)=18x$

$\implies \ 5(30x-540)=6x$

$\implies \ 150x-2700=6x$

$\implies \ 144x=2700\implies \ x=18.75$

Therefore, the speed of Sali is 18.75 km/hr.

To learn more about the speed visit:

brainly.com/question/7359669.

#SPJ1

4 0

1 year ago

In a song competition, a participant has to score a total of at least 20 points in the first four rounds combined to move on to

arsen [322]

Answer:

2+3p ≥ 20

Step-by-step explanation:

2 is the amount of points he earned

3 is how many rounds were left before finals

p is the additional points he earned

and ≥ 20 is he had to earn greater than or equal to 20 points total to move on.

6 0

3 years ago

Read 2 more answers

Write 2 ratios that are equivalent to 9/12

zhenek [66]

Two ratios are 3:4 and 18:24

7 0

2 years ago

Read 2 more answers