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zloy xaker [14]
2 years ago
12

A local university produces a study in which it chose 1000 students to participate the study asked each student to write down th

e number of hours spent studying in one week period which element of expire the design is known to be part if this study
a. blinding
b. replication
c. randomization
Mathematics
1 answer:
IgorLugansk [536]2 years ago
6 0
A. Randomization
The selection is based on random selection
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6. Using the discriminant, determine the value of k that will give 1 solution (i.e. discriminant equals zero) y = kx²-4x + 4 ​
Gwar [14]

Answer:

k = 1

Step-by-step explanation:

<u>Discriminant</u>

b^2-4ac\quad\textsf{when }\:ax^2+bx+c=0

\textsf{when }\:b^2-4ac > 0 \implies \textsf{two real roots}

\textsf{when }\:b^2-4ac=0 \implies \textsf{one real root}

\textsf{when }\:b^2-4ac < 0 \implies \textsf{no real roots}

As we need to determine the value of k that will give <u>one solution</u>, set the <u>discriminant to zero</u>.

<u>Given equation</u>:

y=kx^2-4x+4

Therefore:

  • a = k
  • b = -4
  • c = 4

Substitute these values into the discriminant and solve for k:

\begin{aligned}b^2-4ac & = 0\\\implies (-4)^2-4(k)(4) & = 0\\16-16k & = 0\\16k & = 16\\\implies k & = 1\end{aligned}

4 0
1 year ago
How many whole numbers leave a remainder of 2 when divided into 56, and a remainder of 1 when divided into 28? a.) 0 b.) 2 c.) 3
meriva

56 would have a remainder of 2 using multiples of 3

56/3 = 18 remainder 2

56/6 = 9 remainder 2

56/9 = 6 remainder 2

56/18 = 3 remainder 2

56/27 = 2 remainder 2

Now divide 28 by the above numbers to see which ones have 1 as a remainder:

28/3 = 9 remainder 1

28/6 = 4 remainder 4

28/9 = 3 remainder 1

28/18 = 1 remainder 10

28/27 = 1 remainder 1

There are 3 numbers that will work.

Answer: c. 3

4 0
2 years ago
Find the remainder when f(x) = 5x3 + 7x + 5 is divided by x + 2
Arte-miy333 [17]
The answer: It’s A- -49
:)
4 0
2 years ago
Read 2 more answers
Find the cost in cents of 1.7kg of potatoes at 70 #per kg
Mrrafil [7]
What is the unit of currency here?  "  #  " does not represent any currency, but rather is a representation of "pound" (the unit of weight, not the British pound).

If you do mean "British pound," then

70 British pounds
------------------------ = 41.2 pence (like pennies) per kg.
     1.7 kg
8 0
3 years ago
Help me please ! i’ll mark brain list and double the points .
charle [14.2K]

Answer:

32

Step-by-step explanation:

that just is the answer use pyth theorem them add 8

8 0
3 years ago
Read 2 more answers
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