CAN SOMEONE HELP EM WITH THSES TWO QUESTIONS AND EXPLAIN HOW YOU GOT IT IF YOU DO THAT I WILL GIVE YOU THE CROWN AND FIVE STARS

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

The area of a 25-inch tv screen is 300 square inches. the area of a 40-inch tv screen is 768 square inches. the are of the smaller screen is what percent of the area of the larger screen?

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?