Fun Formulas

Mix.install([
  {:youtube, github: "brooklinjazz/youtube"},
  {:hidden_cell, github: "brooklinjazz/hidden_cell"},
  {:tested_cell, github: "brooklinjazz/tested_cell"},
  {:utils, path: "#{__DIR__}/../utils"}
])

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Setup

Ensure you type the ea keyboard shortcut to evaluate all Elixir cells before starting. Alternatively you can evaluate the Elixir cells as you read.

Fun Formulas

As developers, it’s our job to translate business requirements into something that the computer understands.

These exercises will have you convert a common formula into an Elixir program.

Loading Bar Percentage

We often need to display loading bars to the user. Loading bars use the current percentage they have finished loading in order to display the loading progress.

You can calculate the percentage with $\frac{actual\ value}{total\ value}\times100$

For example if we complete 7 out of 10 items, we would be 70.0% complete.

7 / 10 # 70.0

Use arithmetic operators to determine the percentage given we have completed 12 out of 42 items.

Hint

actual = 12
total = 42

actual / total

Enter your solution below.

Rocket Ship

We’re building a rocket ship app to teach people about physics.

Users can enter the mass and acceleration of a ship to visualize the force generated.

Given that ${mass} * {acceleration} = force$, calculate the force when mass is 10 and acceleration is 50.

Hint

mass = 10
acceleration = 50

mass * acceleration

Enter your solution below.

What Do You Tip?

It’s common in many cultures to leave a tip whenever you buy a meal. It’s common to calculate the tip as a percentage of the meal.

Given the initial cost of a meal is 20, and you want to leave a 15% tip, use arithmetic operators to determine the total cost of the meal.

Hint

initial_cost = 20
tip_percent = 1.15

initial_cost * tip_percent

Enter your solution below.

Pythagorean Theorum

To calculate the longest side of a triangle we use $a^2 + b^2 = c^2$

Given a triangle where side $a$ is 4, and side $b$ is 10, calculate $c^2$

Hint

a = 4
b = 10

a ** 2 + b ** 2

Enter your solution below.

Bonus: Square Root

Earlier we calculated $c^2$ for pythagoream theorum. Given $c^2$ is 116 determine the square root of $c^2$ to calculate $c$.

Hint

c_squared = 116
:math.sqrt(c_squared)

Enter your solution below.

Commit Your Progress

Run the following in your command line from the beta_curriculum folder to track and save your progress in a Git commit.

$ git add .
$ git commit -m "finish fun formulas exercise"

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