Programming: write a recursive function to_number that forms the integer sum of all digit characters in a string. for example, the result of to_number("3ac4") would be 7. hint: if next is a digit character ('0' through '9'), function is_digit(next) in header will return true.

Robots with telescoping arms are sometimes used to perform tasks (e.g., welding or placing screws) where access may be difficult for other robotic types. during a test run, a robot arm is programmed to extend according to the relationship r = 3 + 0.5cos(4θ) and the arm rotates according to the relationship θ=−π4t2+πt , where r is in feet, θ is in radians, and t is in seconds. use a computer program to plot the path of tip a in x and y coordinates for 0 ≤ t ≤ 4s.

What a backup plan that you have created in a event you encounter a situation

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