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3 years ago

13

Cho hình chóp SABC có đáy ABC là tam giác đều cạnh a tam giác SAB vuông cân tại s và nằm trong mặt phẳng vuông góc với mặt phẳng

đáy cosin của góc giữa đường thẳng SC và mặt phẳng SAB bằng

1 answer:

Leviafan [203]3 years ago

7 0

Answer:

I dont understand what you are saying sorry

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Match the figures with thier name =D--------------C

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2 years ago

A certain stock starts the day at $273/8 per share. If it drops $21/2 during the day, what is its closing value? A. $247/8 B. $2

Elza [17]

Answer:

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Step-by-step explanation:

GIVEN: A stock starts the day at $27 3/8 per share.

Share drops $2 1/2 during the day.

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Solution : first we need to find how many 1/8 are there in 1/2

So, $\frac{\frac{1}{2} }{\frac{1}{8} } =4$

when share drops by $2 then share will be :

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3 years ago

The manager of a mall conducted a survey among two groups (n1 = 100, n2 = 100) of visitors to the mall on different days. She fo

DedPeter [7]

Answer:

Option B - There is at least some difference in the average times spent by the two groups in the mall.

Step-by-step explanation:

A null hypothesis is a hypothesis that states that there is no statistical significance between the two variables. Thus, It is usually the hypothesis that a researcher or experimenter will try to disprove or discredit. While an alternative hypothesis is one that states there is a statistically significant relationship between two variables.

Now, applying these definitions to the question, we can see that;

Null Hypothesis is;

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While the alternative hypothesis is;

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3 years ago

Katy makes 48 cookies an hour. If she has 24 alr, how long would it take her to make 120?

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Question:

Katy makes 48 cookies an hour. If she has 24 already, how long would it take her to make 120?

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Step-by-step explanation:

Given:

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= Number of cookies X time taken to make one cookie

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