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miv72 [106K]
2 years ago
4

Factorise fully 21a - 7a^2

Mathematics
2 answers:
photoshop1234 [79]2 years ago
6 0

Answer:

7(3a-a^2)

Step-by-step explanation:

7 divided into 21 is 3

7(3a-a^2)

MrRissso [65]2 years ago
5 0
3a(7-a)
Have a great day!!!
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What is the result when 0.81x - 0.45 is subtracted from 3.28x + 1.4
sladkih [1.3K]
<span> 0.81x - 0.45 is subtracted from 3.28x + 1.4

</span>3.28x + 1.4 - (0.81x - 0.45) = 3.28x + 14 - 0.81x + 0.45

= (3.28x - 0.81x) + ( 14 +0.45)

= 4.09x + 14.45
6 0
2 years ago
The R.R. Bowker Company of New York collects data on annual subscription rates to periodicals. Results are published in Library
Igoryamba

Answer:

90%

Step-by-step explanation:

Let's call the percentage of students that read Time magazine by P(T), and the percentage of students that read U.S News and World Report by P(U). So, we have that:

P(T) = 0.63

P(U) = 0.51

P(T and U) = 0.24

To find the percentage of students that read either the Time magazine or the U.S.News and World Report magazine (that is, P(T or U)), we can use this formula:

P(T or U) = P(T) + P(U) - P(T and U)

So, we have that:

P(T or U) = 0.63 + 0.51 - 0.24 = 0.90

So the probability is 90%

6 0
2 years ago
Find the length of one side of a regular hexagon whose perimeter is 75 feet.
PIT_PIT [208]

Given that the perimeter of a regular hexagon is 75 feet, determine the length of one side.

Given:

Perimeter : 75 ft.

Find:

Side Length:

Work:

Hexagon = 6 six sides

Divide perimeter by amount of sides (6).

75/6 = 12.5

1 side = 12.5 ft

Thus, the length of side on the hexagon is 12.5ft or 12 and 1/2 feet.

6 0
2 years ago
Carlos is analyzing the results of an experiment on two groups of mice in which he compared the difference in their weight gain
Arlecino [84]
Given:difference in the mean weight gain is 0.60 gramsstandard deviation of the difference in sample mean is 0.305
68% confidence interval for the population mean difference is a) 0.305
0.60 + 1 * 0.3050.60 + 0.305 = 0.9050.60 - 0.305 = 0.295
95% confidence interval for the population mean difference is c) 0.61
0.60 + 2 * 0.3050.60 + 0.61 = 1.210.60 - 0.61 = -0.01

3 0
2 years ago
william is thinking of two numbers both numbers are square numbers greater than 1 the sum of numbers is 100 write down two numbe
zheka24 [161]

Answer:

Step-by-step explanation:

At first,

Let start writing the squares of number 0 to 10,

0²=0

1²=1

2²=4

3²=9

4²=16

5²=25

6²=36

7²=49

8²=64

9²=81

10²=100

Now,

According to your question,

  1. The two numbers should be square numbers
  2. They should be greater than 1.
  3. Their sum should be 100.

Hence, your given conditions matches with the numbers 64 and 36.

Therefore, the numbers are 64 and 36.

  • 64 and 36 are greater than 1.
  • 64 is a square of 8 and 36 is the square of 6.
  • 64+36=100
3 0
2 years ago
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