$1\mathrm{.}5$ Writing programs

Given an individual's gross revenue between $2000$ and $3000,$ write an algorithm that computes

the taxes levied on this individual.

We know that, between $2000$ and $3000,$ taxes amount to $500+47\mathrm{.}5\%$ of the part that exceeds

$2000.$

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Explain what this algorithm does, and give its specifications.

$\frac{?}{{?}_{\frac{?}{?}}}3.$ Write a program that gives a disc's perimeter given its radius. The radius length is given in mm$.$

What do you have to add or modify to compute and display the disc's area $?$

$,4.$ Write a program that receives five values from the user, and displays their average.

$\frac{?}{{?}_{\frac{?}{?}}},5.$ Write a program that asks the user for parameters $a,b,c$ for the quadratic formula $f(x)=a{x}^2+bx+c.$

Then, the program asks the user to provide a specific $x,$ and calculates $f(x).$

$\frac{?}{{?}_{\frac{?}{?}}},.$ Write a program that swaps the values contained in variables A and $B.$ The values are provided by

the user.