Which operation will change the value of any non zero number?
a. adding zero
b. multiplying by zero
c. multiplying by one
d. dividing by one

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

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

Find the midpoint m of z1=(8+5i) and z2=(12+3i)