The value of 3^21 is how many times as great as the value of 3^19?​

Which of the following of the following sets of side lengths could not form a triangle?

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?

Ahighway between points a and b has been closed for repairs. an alternative route between there two locations is to travel between a and c and then from c to b what is the value of y and what is the total distance from a to c to b?