a.) so i was trying to evaluate this

(log5 4 x log2 10)/log25 sqrt10

so what i did was do change of base on the numerator than i got 4 (is doing this correct?) then after i got this well i got stuck on what to do next. help?

b.) one last i came across this problem log3 (x+2)=3logx 3

i got stuck on this as well, what would i do to find x?

thank you for your time