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3 years ago

I really need help with this question! Please help me!!!

Mathematics

1 answer:

Dafna11 [192]3 years ago

7 0

Answer:

42°

Step-by-step explanation:

AD bisects ∠CAB, which means it splits ∠CAB into two equal parts. ∠CAB equals 84°. 84° ÷ 2 = 42°.

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the factor tree for 60 has all of the factors in the factor trees for 15 and 30, but not 45. explain why this is true

adoni [48]

15 and 30 are factors of 60 but 45 is not

4 0

3 years ago

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College students average 8.6 hours of sleep per night with a standard deviation of 35 minutes. If the amount of sleep is normall

Soloha48 [4]

Answer:

4.27%

Step-by-step explanation:

We have been given that college students average 8.6 hours of sleep per night with a standard deviation of 35 minutes. We are asked to find the probability of college students that sleep for more than 9.6 hours.

We will use z-score formula to solve our given problem.

$z=\frac{x-\mu}{\sigma}$

z = z-score,

x = Random sample score,

$\mu$ = Mean,

$\sigma$ = Standard deviation.

Before substituting our given values in z-score formula, we need to convert 35 minutes to hours.

$35\text{ min}=0.58\text{ Hour}$

$z=\frac{9.6-8.6}{0.58}$

$z=\frac{1}{0.58}$

$z=1.72$

Now, we need to find $P(z>1.72)$ .

Using formula $P(z>a)=1-P(z$ , we will get:

$P(z>1.72)=1-P(z$

Using normal distribution table, we will get:

$P(z>1.72)=1-0.95728$

$P(z>1.72)=0.04272$

$0.04272\times 100\%=4.272\%$

Therefore, 4.27% of college students sleep for more than 9.6 hours.

7 0

3 years ago

An average drop of blood contains about 1.6 x 10^4 white blood cells. A rare drop of blood contains about 5 x 10^4 white blood c

Alekssandra [29.7K]

Answer:

3.4 x 10^4

Step-by-step explanation:

1.6 x 10^4 - 5 x 10^4 = -3.4 x 10^4

5 x 10^4 - 1.6 x 10^4 = 3.4 x 10^4

6 0

3 years ago

CAN YOU PLZ ANSWER THE QUESTION IT IS THE PICTURE!!!

kupik [55]

Answer:

17 pizzas an hour

Step-by-step explanation:

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7 0

2 years ago

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There are a rack of 14 billiard balls. Balls numbered 1 through 8 are solid-colored. Balls numbered 9 through 14 contain stripes

Jet001 [13]

Answer:

3/7 / 42.8% chance

Step-by-step explanation:

There are 6 striped balls (9, 10, 11, 12, 13, 14) and 8 (1, 2, 3, 4, 5, 6, 7, 8) solid colored balls. So, 6 / 14 balls are striped.

(6 / 14 = 3 / 7)

this means that the probability of a ball being striped has the odds of 3/7

(3/7 = about 42.8% chance)

6 0

1 year ago