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guajiro [1.7K]
3 years ago
12

X and Y together complete a task in 4 days, Y and Z together in 5 days. If they work independently, who will finish the work in

the least time? A. X B. Y C. Z D. Not enough information to decide
Mathematics
1 answer:
pav-90 [236]3 years ago
4 0

Answer:

c, Z

Step-by-step explanation:

x+y=4

<u>y+z=5</u>

y=4-x

4-x+z=5

<u>-</u><u>x</u><u>+</u><u>z</u><u>=</u><u>1</u>

z=1+x

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8 0
3 years ago
The difference of a number and -6 is less than 9 write an inequality and solve
Pavlova-9 [17]

Answer:

n - (-6) < 9

n < 3

Step-by-step explanation:

When setting up an inequality, using the key words from the problem will help.  The word 'difference' would indicate subtraction and 'less than' would be the '<' inequality sign.  Since the expression is 'the difference of a number and -6', we write:  

n - (-6) < 9

Whenever we subtract a negative number, we change both signs to positive:

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Using inverse operations to solve:  n + 6 - 6 < 9 - 6

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8 0
3 years ago
HELPPP! I’ll mark Brainliest (NO joke answers)
Licemer1 [7]

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3 years ago
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Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life h
mrs_skeptik [129]

Answer: 3424.28

Step-by-step explanation:

Given data : 378, 361, 350, 375, 200, 391, 375, 368,  321

Number of data values = 9

Mean :\overline{x}=\dfrac{\sum^n_{i=1} x_i}{n}

\\\\=\dfrac{378+361+350+375+200+391+375+368+321}{9}\\\\=\dfrac{3119}{9}\approx346.56

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Variance = \dfrac{27394.2224}{8}=3424.2775\approx3424.28

4 0
3 years ago
Hurry please <br><br> What is the rule for the reflection?
Crank

Answer:

When you reflect a point across the line y = x, the x-coordinate and y-coordinate change places. If you reflect over the line y = -x, the x-coordinate and y-coordinate change places and are negated (the signs are changed). the line y = x is the point (y, x). the line y = -x is the point (-y, -x).

Step-by-step explanation:

Hope you understand

4 0
3 years ago
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