Application of cauchy-riemann equations in real life?

How many four digit numbers are possible from the digit 0'1'2'3'4 numbers may be repeated? How do you solve this equation 4y plus 228 equals 352? What is the difference between plenty of a great number of? How do you write 0. 924? What is the perimeter of a circle also known as? What is 2 equivalent units for work? What is the product of 4 and eight times c? How many 4 digit combinations can be made using 0 through 9 and using each number only once? What is the circumference of a triangle with sides 4cm 6cm and 8cm? What number multiplied by itself gives the answer 12345678987654321? How many horsepower is 6.25 gross torque? What is eighteen thirty fifths written as a decimal? 8x-7 plus 2x equals 6 plus 5x plus 2 equals? What is 1.8 times 100? What is one fifth of four thousand dollars? Which measure is less than 435 inches 37ft 36ft10in 12yd 3in or 12ft 3in? What number is after 161 in this sequence 1-5-17-53-161? How many miles are there in 90000 kilometers? What does kilocalories mean? How do you solve the math problem a squared plus 2a minus 3 equals 0?