Identify the correct operation.7)to find how much greater one number is than another.8)to find the total amount of 3 unequal measures.9)to find the total amount of 24 equal measures.10)to find the size of each equal portion of an amount.

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

Step by step explanation pls for 10 pts the length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?  

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )