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aalyn [17]
3 years ago
11

BRAINLIESTT ASAP! PLEASE HELP ME :)

Mathematics
2 answers:
Nuetrik [128]3 years ago
7 0
<h3>Answer: 18/5 hours</h3>

Alternative formats are:

18/5 hours = 3 & 3/5 hours

18/5 hours = 3.6 hours

3.6 hours = 3 hours, 36 minutes

================================================

Explanation:

Let,

x = time it takes for Blake to do the job alone

y = time it takes for Ned to do the job alone

z = time it takes to do the job if they work together

In this case,

x = 9, y = 6 and z is unknown which we want to solve for.

The equation to solve is

1/x + 1/y = 1/z

So,

1/x + 1/y = 1/z

1/9 + 1/6 = 1/z

18z(1/9 + 1/6) = 18z(1/z)

18z(1/9) + 18z(1/6) = 18z(1/z)

2z + 3z = 18

5z = 18

z = 18/5

It takes them 18/5 hours if they worked together.

----------------

Here's an alternative way to look at it

Blake takes 9 hours if he works alone, so his rate is 1/9 of a room per hour. Similarly, Ned's rate is 1/6 of a room per hour. Their combined rate is

1/9 + 1/6 = 2/18 + 3/18 = 5/18

So,

(total rate)*(total time) = 1

(5/18)*z = 1

z = 1/(5/18)

z = 18/5

----------------

Side note

18/5 = (15+3)/5

18/5 = 15/5 + 3/5

18/5 = 3 + 3/5

18/5 = 3 & 3/5

also,

18/5 = 3 + 3/5

18/5 = 3 + 0.6

18/5 = 3.6

and,

3.6 hours = 3 hours + 0.6 hours

3.6 hours = 3 hours + (0.6*60 minutes)

3.6 hours = 3 hours + 36 minutes

3.6 hours = 3 hours, 36 minutes

Lana71 [14]3 years ago
5 0

Answer: The answer is 15

Step-by-step explanation: because 9+6 =15

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The statement tan theta -12/5, csc theta -13/5, and the terminal point determined by theta is in quadrant 2."​
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Answer C:

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3 years ago
Haley and Nicole stopped at the school bookstore for extra supplies. Haley
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Answer:

Step-by-step explanation:

8p+3f=10.39

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subtract

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Standardized tests: In a particular year, the mean score on the ACT test was and the standard deviation was . The mean score on
Scorpion4ik [409]

Complete question :

Standardized tests: In a particular year, the mean score on the ACT test was 19.3 and the standard deviation was 5.3. The mean score on the SAT mathematics test was 532 and the standard deviation was 128. The distributions of both scores were approximately bell-shaped. Round the answers to at least two decimal places. Part: 0/4 Part 1 of 4 (a) Find the z-score for an ACT score of 26. The Z-score for an ACT score of 26 is

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1.26

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Given that:

For ACT:

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Standard deviation, s = 5.3

Zscore for ACT score of 26;

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= 1.26

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16 percent of 32 million
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