Answer:
(a) 3, 5 and 6
Step-by-step explanation:
In the experiment, 43 are to be given a gel that contains the tooth-whitening chemicals while the remaining 42 are to be given a placebo. Therefore, a placebo is used.
The 43 that will receive the gel are to be selected randomly.
After the experiment, the whiteness of the two groups will be compared to see the effect of the gel.
Therefore for the experiment to be completely random, 3, 5, and 6 apply.
(b)
For the experiment to be double-blind, the researchers who will evaluate the whiteness and interact with the subjects, and the subjects would not know which subjects received either the whitening gel or the placebo.
Answer: (-2)(4)
Step-by-step explanation:
The model could be explained as follows ;
Step 1 : 0 - - - - > - 2 = - 2 units
Step 2 : -2 - - - - > -4 = - 2 units
Step 3: - 4 - - - - > -6 = - 2 units
Step 4: - 6 - - - - > -8 = - 2 units
-2 units for reach of the 4 steps
Therefore, model is expressed as :
(-2) × 4
(-2)(4)
Kindly view detailed sketch and explanation in the picture attached.
Answer: 5-6i
The rule is that if f(x) has real number coefficients, then a root of x = a+bi pairs up with its conjugate pair of x = a - bi. In this case, a = 5 and b = 6.
Answer:
9.63 metres
Step-by-step explanation:
The base to height ratio =12:1
From the given ramp, Base to Height Ratio =Base:0.8
Therefore:
12:1=Base:0.8

To find the length of the ramp, we apply Pythagoras theorem in the right triangle formed.
Length of the ramp ,l
