Just took Penn Foster test, and the answer is D. 30 and 45
Answer: independent
Explanation:
An independent variable remains under the control of the experimenter. The variable can be altered according to the desire of the experimenter. Thus the changes that occurred in the independent variable causes the changes in the dependent variable or experimental variable. The experimental variable is the outcome for the purpose of study.
The distance of the object is the independent variable, as this can be changed and will affect the fact that how the object is perceived which is the dependent or the experimental variable.
Answer:
By the time of the First Dynasty, international trade had been initiated with the regions of the Levant, Libya, and Nubia. Egypt had a trading colony in Canaan, a number in Syria, and even more in Nubia.
Explanation:
Sampling is one of the most important aspects of research design because using the correct form of sampling allows you to generalize without having to ask everyone. There are certain rules to follow to ensure your sampling is valid and reliable.
Answer:
B. the control of oil (not sure though that makes more sense)