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Lubov Fominskaja [6]
3 years ago
13

John’s dog weighed 7 pounds when he got him. The dogs weight tripled each year for two years. How many ounces did John’s dog now

weigh?
Mathematics
1 answer:
cricket20 [7]3 years ago
4 0

Answer:

Step-by-step explanation:

1st year- 7*3=21

2nd year- 21*3=63

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Kenji buys 3 yards of fabric for $7.47. Then he realizes that he needs 2 more yards. How much will the extra fabric cost?
bixtya [17]
3 yards fabric costs $7.47
1 yard fabric costs $7.47 / 3
2 yard fabric costs $7.47 / 3 * 2
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6 0
2 years ago
If (7^2)x=1 what is x
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1/49 ..................
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3 years ago
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The pH of randomly selected swimming pools follows a normal distribution with mean 7.4 and standard deviation 0.22. A pool shoul
skad [1K]

Answer:

78.383%

Step-by-step explanation:

The pH of randomly selected swimming pools follows a normal distribution with mean 7.4 and standard deviation 0.22. A pool should have a pH between 7.2 and 7.8 so that chlorine treatment is effective.

Using z score formula

z = (x-μ)/σ, where

x is the raw score

μ is the population mean

σ is the population standard deviation.

For x = 7.2

z = 7.2 - 7.4/0.22

z = -0.90909

Probability value from Z-Table:

P(x = 7.2) = 0.18165

For x = 7.8

z = 7.8 - 7.4/0.22

z = 1.81818

Probability alue from Z-Table:

P(x = 7.8) = 0.96548

The probability of pools having an acceptable pH level(7.2 and 7.8)

= P(x = 7.8) - P(x = 7.2)

= 0.96548 - 0.18165

= 0.78383

Converting to percentage

0.78383 × 100

= 78.383%

The percentage of pools having an acceptable pH level is 78.383%

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3 years ago
Solve the inequality.
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The answer is C. Divide by -6 on both sides. The sign is flipped when you divide by a negative that's why its C and not A
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