2b. Add then divide, so 9+8=17, then answer = 17/7 unless you have to write in improper faction.
3b. 5^3= 5 x 5 x 5
I'm going to assume the rate, 3.9%, is for one year.
7550 * 3.9 * 6 = $176, 670 is the simple interest earned in 6 years with a rate of 3.9% per year.
Since you have the formula, why don't you do it yourself?
Answer:
In a pulley, the ideal mechanical advantage is equal to the number of rope segments pulling up on the object. The more rope segments that are helping to do the lifting work, the less force that is needed for the job.
X1=radical 6--->2.44
X2=-radical 6/3--->-0.816
It will equal 1/3 4/12= 1/3 1/3 is the answer
