Suppose the string variable pn is a phone number in the form "xxx-xxx-". write an expression whose value is the phone number contained in pn converted into the format "(xxx) xxx-". so the string "219-989-2273" would be converted to "(219) 989-2273". you can assume that the phone number in pn is formatted correctly.

A1.5-in-diameter bar has been machined from an aisi 1050 cold-drawn bar. this part is withstand a fluctuating tensile stress varying from 0 to 18.0 kpsi. because of the ends, and the fill radius, a fatigue stress-concentration factor ky is 1.6 for 10 or larger life. the fully correcte endurance limit is s 34 kpsi, sat= 100 kpsi and s, 84 kpsi. find the factor of safety guardin against fatigue, using the modified goodman fatigue line and first-cycle yielding