Answer:
3 1/3 Hz
Step-by-step explanation:
Frequency is measured in "cycles per second," now given the name "hertz". The number of cycles per second is ...
(15 m/s)/(4.5 m) = 3 1/3 Hz
All squares are rectangles. All rectangles have four sides. Logic, therefore, tells you that all squares have four sides.
It is dangerous to drive when it is snowing. It is snowing now. Logic tells you that it would be dangerous to drive right now.
All dogs have a good sense of smell. Bailey is a dog. Therefore, deductive reasoning logic tells you that Bailey has a good sense of smell.
All seniors are bad drivers. Mr. Jones is 70 years old and you won't let him drive your car because you think he is an unsafe driver.
When it rains the trees get wet. The trees are wet this morning, so it rained last night.
All trees have trunks. An oak tree is a tree. Therefore, deductive reasoning tells you that the oak tree has a trunk.
Divide 12 on both sides
ds/w=cd/12
now multiply ds on both sides
w=cd/12ds
Using substitution:In the first equation, look to solve for x
{x + 3 y = 8
{4 x - y = 6
Subtract 3 y from both sides:
{x = 8 - 3 y
{4 x - y = 6
Substitute x = 8 - 3 y into the second equation:
{x = 8 - 3 y
{4 (8 - 3 y) - y = 6
4 (8 - 3 y) - y = (32 - 12 y) - y = 32 - 13 y:
{x = 8 - 3 y
{32 - 13 y = 6
In the second equation, look to solve for y:
{x = 8 - 3 y
{32 - 13 y = 6
Subtract 32 from both sides:
{x = 8 - 3 y
{-13 y = -26
Divide both sides by -13:
{x = 8 - 3 y
{y = 2
Substitute y = 2 into the first equation:
Answer: {x = 2
{y = 2
Five factors that should be controlled are the dose of the medicine, the time the patients take this medicine, their diet, the stage of this disease and medicine composition.
<h3>Why should some factors be controlled?</h3>
This is done to avoid bias or imprecise results.
<h3>What factors should be controlled?</h3>
Factors related to the medicine itself and factors that can affect the results should be controlled. This includes:
- The dose given to the patients.
- The stage of the disease that should be similar for all patients.
- The medicine compositon and manufacturer.
- The number of day patients take the medicine.
- The patients' diet.
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