The function c=2.50(n-2)+1.50 represents the cost c in dollars of printing n invitations. which of the following is not true?

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

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

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?