Answer:
7 hours
Step-by-step explanation:
24 + 3x = 45
3x = 21
x=7
Answer: x=9
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The fraction of the furniture sold that are tables is given by 1/2y / (1/3x + 1/3y)
<h3>Equation</h3>
Let
- number of chairs = x
- Number of tables = y
Number of tables and chairs sold = 1/2(x + y)
= 1/2x + 1/2y
- Fraction of chairs sold = 1/2x
- Fraction of tables sold = 1/2y
Furniture remaining = 1/3(x + y)
Fraction of tables sold = 1/2y ÷ 1/3(x + y)
= 1/2y ÷ 1/3x + 1/3y
= 1/2y × 1 / (1/3x + 1/3y)
= 1/2y / (1/3x + 1/3y)
Therefore, the fraction of the furniture sold that are tables is given by 1/2y / (1/3x + 1/3y)
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-8
2/3(-21/3) + 2/3(-15/3)
-42/9 + -30/9
-72/9 = -8
Answer:
17000 batteries
Step-by-step explanation:
Three years and one month is equivalent to the mean minus one standard deviation.
Three years and seven months is equivalent to the mean plus one standard deviation.
For a normal distribution, we know that 68% of population is between mean ± 1 sd, then can be expected that 25000*68% = 17000 of batteries last between three years and one month and three years and seven months
