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Lady bird [3.3K]
2 years ago
13

Expand the following

Mathematics
2 answers:
harina [27]2 years ago
8 0

Answer:

a) 4x+4

b) 7x-14

c) 12x +18

d) 10x-10y

kenny6666 [7]2 years ago
3 0

Answer:

4x+4

7x-14

12x+18

10x-10y

Step-by-step explanation:

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The SAT Reasoning Test (formerly called the Scholastic Aptitude Test) is perhaps the most widely used standardized test for coll
mihalych1998 [28]

Given Information:  

Mean SAT score = μ = 1500

Standard deviation of SAT score = σ = 3 00

Required Information:  

Minimum score in the top 10% of this test that qualifies for the scholarship = ?

Answer:

\bar{x} = 1884\\

Step-by-step explanation:

What is Normal Distribution?

We are given a Normal Distribution, which is a continuous probability distribution and is symmetrical around the mean. The shape of this distribution is like a bell curve and most of the data is clustered around the mean. The area under this bell shaped curve represents the probability.  

We want to find out the minimum score that qualifies for the scholarship by scoring in the top 10% of this test.

P(X > \bar{x} )= P(Z > \bar{x}) = 0.10\\P(X < \bar{x} )= P(Z < \bar{x}) = 1 - 0.10\\P(X < \bar{x} )= P(Z < \bar{x}) = 0.90\\

The z-score corresponding to the probability of 0.90 is 1.28 (from the z-table)

\bar{x} = \mu + z(\sigma) \\\bar{x} = 1500 + 1.28(300)\\\bar{x} = 1500 + 384\\\bar{x} = 1884\\

Therefore, you need to score 1884 in order to  qualify for the scholarship.

How to use z-table?

Step 1:

In the z-table, find the probability value of 0.90 and note down the value of the that row which is 1.2

Step 2:

Then look up at the top of z-table and note down the value of the that column which is 0.08

Step 3:

Finally, note down the intersection of step 1 and step 2 which is 1.28

4 0
3 years ago
Logio1,000 =<br> 1/3<br> 100
Vera_Pavlovna [14]

Answer:

the answer is 1/3

Step-by-step explanation:

HOPE THIS HELPS!!

GOOD LUCK!!!

8 0
3 years ago
What is the percent of 16/25
Lelechka [254]
16/25 = 0.64 = 64%

Another way to do it is to multiply top and bottom by 4
16/25 = (16*4)/(25*4) = 64/100 = 64%

Either way, the answer is 64%
7 0
3 years ago
Read 2 more answers
Very canfused need help
Dvinal [7]
First, find 1/2 of 3. That is 1.5 gallons. Since there are 4 quarts in a gallon, do 1.5*4 to get 6.
8 0
3 years ago
Read 2 more answers
Pythagorean theorem pls help
Zarrin [17]

Answer:

a²+b²=c²

Step-by-step explanation:

8 0
2 years ago
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