In a bag of keys, there are 15 silver keys, 7 black keys, 8 copper keys, and 2 painted keys of various colors. one key is drawn out at random. what is the probability that the key that is drawn is silver or copper?

Awrestling tournament begins with 128 competitors. in the first round, each competitor has 1 match against another wrestler. the winner of each match moves on to the next round until there is a winner. write a sequence in which the terms represent the number of players still in the tournament at the end of each round. describe the sequence? how many rounds are in the tournament?

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

The triangles are similar. what is the value of x? show your work.