Which mathematician is famous for his work on calculus and its fundamental theorem?

What is the least common multiple (LCM) of 6 and 8?

If the perimeter of a rectangle is 30 cm and the length is 9 cm, what is the width?

Who is known as the father of geometry?

What is the mean of the numbers 3, 8, 10, and 5?

What is the area of a rectangle with a length of 12 cm and a width of 5 cm?

Who is known for the series of numbers named after him, where each number is the sum of the two preceding ones?

Which mathematician is famous for his formula that connects the complex exponential function to trigonometric functions?