1/2log2(x^4)+1/4log2(x^4)-1/6log2x. how do i turn this into a single logarithm?

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?