Find the fourth roots of 256(cos 280° + i sin 280°)

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

Which expression gives you the distance between the points (5,1)and(9,-6)