A riverboat travels at an average of 14 km per hour in still water. The riverboat travels 130 km east up the Ohio River and 130 km west down the Ohio River in a total of 19.5 hours. To the nearest tenth of a kilometer per hour, what was the speed of the current of the river?

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

what level of math? also i don't need to be paid if i can you.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.