If six people come to a party and shake hands with each other. if each person shakes the hand of every other person, how many handshakes occur?

The expression 20l+25g-10 calculates the number of dollars that the abc lawn company. how many dollars does the company make from raking 444 gardens and mowing 333 lawns

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.