<span>you have to take arctan(0) to find the value of theta.
tan^-1 (x)=theta </span>
Answer:
Internal validity
Step-by-step explanation:
The internal validity here is weak
Internal validity describes the extent to which an evidence weighs the cause and effect claim. In this study, the internal validity that brought about failure in the new exam is mainly due to the environment where the exam was written and not the new exam itself.
So this validity is weak in claiming that the new exam is not a good substitute for the old exam.
Putting them in the same good environment might help the researchers to draw a better conclusion.
If you would like to calculate <span>10÷5/8, you can do this using the following steps:
</span><span>10÷5/8 = (10/5)/8 = 2/8 = 1/4 = 0.25
The correct result would be 1/4 or 0.25.</span>
Answer:
Step-by-step explanation:
{x -4y = −21
{8y - x = 45
_________
[Plug this back into both equations above to get the x-coordinate of 3]; 
I am joyous to assist you anytime.
