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2 years ago

What expression is equivalent to -3 - (7.5 + 4)?

Mathematics

1 answer:

postnew [5]2 years ago

7 0

parenthesis first -3-11.5

then subtract so your answer is -14.5

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Mr. Li has a bag of Skittles. There are 5 blue Skittles, 3

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Answer:

1/4

Step-by-step explanation:

5/20 because you have 5 possibilities to pulling out a blue one from all in all 20

Simplified :

5/20 divided by 5

1/4

Bonus in percent

100%:4= 25%

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3 years ago

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2 years ago

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3 years ago

X^2+ x - 2/x^3 - x^2 + 2x - 2

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3 years ago

A particular fruit's weights are normally distributed, with a mean of 476 grams and a standard deviation of 36 grams. The heavie

4vir4ik [10]

Answer:

Step-by-step explanation:

Given that:

mean (μ) = 476 grams, standard deviation (σ) = 36 grams. P(z) = 19%

The z score shows by how many standard deviation the raw score is above or below the mean. It is given by the equation:

$z=\frac{x-\mu}{\sigma}$

Since the 19% weigh more, therefore 81% (100% - 19%) weigh less.

From the normal distribution table, the z score that corresponds to a probability of 81%(0.81) = 0.87

We substitute z = 0.88 in the z score equation to find the raw score. Therefore:

$z=\frac{x-\mu}{\sigma}\\0.87=\frac{x-476}{36}\\ x-476=31.32\\x=31.32+476\\x=507.32\\$

x ≅ 507 grams

Therefore 19% of fruits weigh more than 507 grams

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2 years ago