What is r to the 3rd times s to the 5th times s to the -2 times r to the 3rd?

Find the value of the variable and the length of each chord for #5 and #6.

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units

5. divide and simplify if possible. √250x16√2x 6. what is the solution of the equation? √2x+13−5=x