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4 years ago

Whats 4 1/2 * 6/100 explain please! Thank you!

Mathematics

1 answer:

SVETLANKA909090 [29]4 years ago

8 0

0.27 is the answer, hope it helps

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50 + 2x = 100 What is x?

max2010maxim [7]

Answer:

x = 25

Step-by-step explanation:

50 + 2x = 100

=> 2x = 50

=> x = 25

Hoped this helped.

4 0

3 years ago

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The average adult gets 7.45 hours of sleep each night, with a standard deviation of 0.65 hours. A pharmaceutical company develop

eduard

Answer:

At least 8.96 hours of sleep to be in the top 1%.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

$\mu = 7.45, \sigma = 0.65$

How many hours of sleep to be on the top 1%?

The top 1% is the 100 - 1 = 99th percentile, which is X when Z has a pvalue of 0.99. So X when Z = 2.327. Then

$Z = \frac{X - \mu}{\sigma}$

$2.327 = \frac{X - 7.45}{0.65}$

$X - 7.45 = 0.65*2.327$

$X = 8.96$

At least 8.96 hours of sleep to be in the top 1%.

8 0

4 years ago

Define a variable and write an expression for the phrase the quotient of 2 times a number and 19

Anna11 [10]

Let the number of apples in a bag be x apples. Basically its assigning a letter (variable) to an unknown quantity.
The phrase in the question can be written as
2x / 19 where x is a variable. 2x means '2 times x'.

8 0

4 years ago

Answer the following equations:

Andrew [12]

Step-by-step explanation:

3(t+5) = 9

3t+15 = 9

3t = -6

t = -2

2(f-7) = -10

2f - 14 = -10

2f = 4

f = 2

-(c - 9) = 4

-c + 9 = 4

-c = -5

c = 5

-6(2t + 8) = -84

-12t - 48 = -84

-12t = -36

12t = 36

t = 3

-10 (s + 2) = -57

-10s - 20 = -57

-10s = -37

s = 3.7

7(3w + 8)/3 = -9

By cross multiplication,

7(3w + 8) = -27

21w + 56 = -27

21w = -83

w = -3.95

35/5 = (F - 32)/9

7 = (F - 32)/9

By cross multiplication,

63 = F - 32

63 + 32 = F

95 = F

Hope it helps.

7 0

2 years ago

HELPPPP ASAP!!! You toss a coin (heads or tails), then spin a three-color spinner (red, yellow, or blue). Complete the tree diag

inn [45]

Answer:

Step-by-step explanation:

5 0

2 years ago

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