?

Find the time t. A=P(1+r/n)^(nt), where

A=the amount after nt

P=the initial deposit

r=the annual rate of interest

n=the number of intervals in a year & n->infinity

when A=2P? Help please.

 Prove that sqr[(r(r^2-3))^2-4]/(r^2-1)=sqr(r^2-4), thank in advance.

n=162a8b is a number of 6 digits, where 0=<a,b<=b. Find all a & b

such that n can be properly divided by 7.

n=162a8b is a natural number of 6 digits, where

0=<a,b<=9. Find all a, b such that n is properly

divisible by 7.

Stephen decides to spend up $300 to buy x pairs of shoes,

y shirts & z jeans. A pair of shoes costs $40; a jacket $68

& a jean $19. How many of each of the items can he buy?

Help please.

If a,b,c are the 3 sides of triangle ABC; r is the radius of the

circumcircle; S is the area of ABC. Prove that r=abc/(4S). Help.

Correction: it should be that c=|r'xr"|/|r'^3|=>c=6t^2/[t^3(4+9t^2)^1.5]=>c=6/[t(4+9t^2)^1.5]. Thus, cv^2=6(4+9t^2)t/(4+9t^2)^1.5=>cv^2=6t/sqr(4+9t^2)=

the normal component. Sorry.