In Exercises 13 through 19, identify the errors. 13. LET phone = "2345678" 14. LET X$ = "2" PRINT "My phone number is "; phone LET y = 3 END PRINT X$ + y END 15. LET quotes = I came to Casablanca for the waters. PRINT quotes; " "; "Bogart" END 16. LET hi-Yo$ = "Silver" PRINT "Hi-Yo "; hi-Yo END 17. LET mid$ = "Ira" PRINT "My middle name is "; mid$ END 18. LET numString = 123 PRINT 2 * VAL(numString) END 19. LET a$ = STR$(23Skidoo) PRINT as END