Add recurring costs and project the monthly total across a year.

Turn distance and fuel efficiency into a trip estimate.

Apply a service charge and divide the final cost per guest.

Combine hours, expenses, and a tax estimate into an amount due.

Adjust ingredient quantities when the serving count changes.

Break a fixed-rate loan formula into readable steps.

Apply a discount, multiply by quantity, and check the order total.

Find the units and sales needed to cover fixed costs.

Subtract an unpaid break from a start and finish time.

Turn a timed distance into a pace for another route.

Use pi to calculate area and circumference from a radius.

Split the discriminant and both roots into checkable lines.