What was the name of the first man made satellite launched by the Soviet Union in 1957.​

Will you chech and finish these for me, because i am stumped with them.

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d