Expert: Paul Klarreich - 12/2/2009

Question
Dear Sir/Madam,
I am mahima, housewife. I am very much interested in learning math. I have the following doubts. If you can clarify me. I am so thankful to you. Please help me.

1)If n  and p  are integers greater than 1 and if p  is a factor of both n +3 and n +10, what is the value of p ?

2)A heavy rope, 100 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high. How much work is done in pulling the rope to the top of the building?

3)Mary, at age 35, decides to deposit $2000 per year in a bank, for the next 30 years. How much will she have at age 65 if her rate of return is assumed to be 10% per annum?

with love,
mahima

Answer
Questioner: mahima
Country: India
Category: Advanced Math
Private: Yes
Subject: mathematics
Question: Dear Sir/Madam,
I am mahima, housewife. I am very much interested in learning math. I have the following doubts. If you can clarify me. I am so thankful to you. Please help me.

1)If n  and p  are integers greater than 1 and if p  is a factor of both n +3 and n +10, what is the value of p ?


>> 7.  If  p | A and  p | B, then  p | (A-B)

2)A heavy rope, 100 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high. How much work is done in pulling the rope to the top of the building?

Send this to the physics section.


3)Mary, at age 35, decides to deposit $2000 per year in a bank, for the next 30 years. How much will she have at age 65 if her rate of return is assumed to be 10% per annum?

Send this to the business arithmetic section.