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code for simple website in html

What does the following rule set do?
tbody tr:nth-child(2n) {
background-color: gray;
}

Can you guys make a website,showing the 7 wonders of the world using HTML?

Suppose you have a certain amount of money in a savings account that earns compound interest, and you want to calculate the amount that you will have after a specific number of months. The formula is as follows:
F = P X (1 + i) ^ t
The terms in the formula are:
F is the future value of the account after the account after the specified time period.
P is the present value of the account.
i is the monthly interest rate.
t is the number of months.
Write a program that executes a loop 5 times. Each step of the loop generate a random value for P, i (between 0 and 10 percent) , and the number of months betwen (1 and 100). The loop should then pass these values to a function that returns the future value of the account, after the specified number of months. The program should display the accounts future value each pass. See sample output below:
Present Value: $500.00
Monthly Interest Rate: .07
Number of Months: 72
Future Value: $65,253.23

A prime number is a number that is only evenly divisible by itself and 1. For example, the number 5 is prime because it can only be divided by 1 and 5. The number 6 however, is not prime because it can be divided evenly by 1, 2, 3, and 6.
Write a Boolean function named isPrime which takes an integer as an argument and returns true if the argument is a prime number of false otherwise. Generate 100 random numbers and display the results of checking each one for primality.
Save this in a script called primes.js.

Create a script called odd_even.js. Write a program that generates 100 random numbers and keeps count of how many of those random numbers are even and how many of them are odd. Sum the even numbers and sum the odd numbers. Use a function to check if a given number is even or odd and use a function that returns the sum of a given array. Display the results as:
Even Number Count: 72
Odd Number Count: 28
Sum Even: 560
Sum Odd: 433