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Paul [167]
4 years ago
11

Find the value of "k", given that one solution of the equation x2-kx+21=0 is 3

Mathematics
1 answer:
Ilia_Sergeevich [38]4 years ago
5 0
Plug in 3 for x and solve for k.
(3)^2-3k+21=0
3k=9+21
3k=30
k=10
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Samuel can type nearly 40 words per minute. Use this information to find the number of hours it would take him to type 2.2 × 105
Dafna1 [17]
I believe the answer is .09625 hours

Explanation: first you do 2.2 x 105= 231
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3 0
3 years ago
Simplify and write the trigonometric expression in terms of sine and cosine:
asambeis [7]

Answer:

we have the expression as;

1/sin u cos u

Step-by-step explanation:

tan u = sin u/cos u

cot u = cos u/sin u

Thus;

sin u/cos u + cos u/sin u

The lcm is sin u cos u

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(sin^2 u + cos^2 u)/sin u cos u

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4 0
3 years ago
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NISA [10]

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its A.

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2 years ago
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True [87]

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4.422 (2 repeats)

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3 0
3 years ago
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Are there any prime numbers that are also square numbers
cestrela7 [59]
The definition of a prime number is one in which there are no factors other than 1 and itself. For example, 5 has no other factors other than 1 and 5 (itself).

The number 1 is not considered prime nor composite.So, even though it is a square (1²), it is not a prime number.

All square numbers have a square root that is neither 1 nor itself: 16 is the square of 4, 49 the square of 7, and so on.

Due to the fact that square numbers have factors other than 1 and itself, square numbers are not prime.

Hope this helps! :)
8 0
4 years ago
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