C for #7. Hopefully someone can help you with 5&6
Answer:
a) The independent variable is the variable which is being taken as the source of an observation. It is the variable which is unaffected (changed) by other factors in the experiment
Here the independent variable is the acidity (concentrations) of the watering solutions
b, The control in the experiment is the plant group which are not administered the treatment of the experiment, such that they are kept the same through out to aid in validation of the correlation between the dependent and the independent variables
The control in the experiment are the group of 20 plants that received neutral water
c. A valid hypothesis is that there is no difference in the level of growth of a plant grown in acid rain and one grown with natural water
d. Limestone is composed of calcium carbonate, which is an alkaline that dissolves in water to form a basic solution that neutralizes the effect of the added acid such that it will invalidate the correlation of the level of plant growth with exposure to acid rain
Step-by-step explanation:
Hello! Your answer is 7 degrees.
A set of complementary angles are ones which, when their measurements are added, will equal up to 90 degrees. For example, the complementary angle of a 80 degree angle would be 10 degrees. A supplementary angle also falls in the same category, however it is adding up to 180 degrees. The way I remember which one is which is that <u>c comes first in the alphabet, and 90 degrees comes before 180 degrees.</u>
Applying that knowledge, 83 plus the complementary angle must equal 90. 83 + 7 = 90, therefore, the complementary angle measures 7 degrees.
Hope this helps!
I wish I can help you but I don’t know sorry I’m in a higher grade
