Answer:
Step-by-step explanation:
Maybe you want to simplify each of these expressions.
2a -1/2a = (2 -1/2)a = (3/2)a
__
3a -1/3a = (3 -1/3)a = (8/3)a
C
the sum to infinity of a geometric series = 
where a is the first term and r the common ratio
=
= 81 × 3 = 243
=sin30cos60 + sin60cos30
=(1/2)(1/2) + (√3/2)(√3/2)
=1/4 + 3/4
=1+3/4
=4/4
=1
I honestly don't know any of this so
Answer:
It took him 12 hours
Step-by-step explanation:
480 / 40=12