13. log6(7x - 2) = 1 + log6(7x + 5) 14. log(x + 7x) = log 18 15. log2 V2x - 7 = 3 16. 5log6 (7w + 1) + 3 = 13 17. 7* = 34 18. 3.5 * = 56.7 19. Johnson placed $15,000 into his credit union account paying 7% compounded semiannually. How much will be in Johnson's account in 5 years? How much interest will he earn? 20. Assuming continuous compounding, what will it cost to buy a $5 item in 4 years at an inflation rate 3%