I'm pretty sure the answer is A
Answer:
It took 50 and 1/2 years.
Explanation:
African American men were granted the right to vote on February 3, 1870 due to the ratification of the 15th amendment. Women were not allowed to vote until August 18, 1920; so it took about 50 and 1/2 years.
Answer:
Muhammad Ali was one of the greatest boxers in history, the first fighter to win the world heavyweight championship on three separate occasions. In addition, he was known for his social message of black pride and black resistance to white domination and for refusing induction into the U.S. Army during the Vietnam War.
Explanation:
Answer:
A control should have been included in the investigation
Explanation:
It is impossible for the student to interpret a correct conclusion about his experiment, without adding a control treatment where he can really compare the differences between the variables.
Control treatment is an element of research that receives all factors, except the variable being tested. The control serves to make comparisons with the other treatments, allowing to observe the exact difference between a system where the variable was tested and the system where it was not.
In the case of the question above, it would have been necessary for the student to have placed a cart on a ramp of normal height and without sandpaper. That way he could compare the speed between this cart and the carts on the other ramps, thus having a correct result.
Is there a link to the video so I can watch it and help you answer this?
