How many different ways can the first ten letters of the alphabet be arranged?

There are 3,628,800 ways to arrange those letters. See explanation for details.

We can solve this task in 2 ways:

First letter can be chosen from all 10, next from 9, third from 8 and so on until you have only one letter left. 
So the number of ways to arrange the letters can be calculated as:

n=10×9×8×7×6×5×4×3×2×1=3,628,800

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500