Answer:

Step-by-step explanation:

Multiply 50 by .4 or .40. Both give the same answer, which is 20.
Answer:
3
Step-by-step explanation:
2x+3=9
2x=9-3
2x=6
2 2
x=3
500.
2 a day times five days a week, times 50 weeks, (each year is 52 weeks, take two off) this equals 500.
Hmm
when x=0, y=1600
when x=1, y=1670
each copy is a change of 70 dollars
when he doesn't sell any copies (x=0), he earns 1600 dollars