Functions in depth
Composition, inverses, transformations, piecewise functions, and function notation.
Precalculus & trigonometry tutoring
Online Precalculus Tutor — the bridge into calculus.
Precalculus is where gaps from earlier courses tend to surface, and where calculus readiness is really decided. Northstar works on both at once: the current coursework and the foundations underneath it.
$50 / 60 minutes · No contracts · No required packages · No charge for missed sessions
What precalculus sessions can cover
The unit circle & trig graphs
Building real intuition for the unit circle instead of memorizing a table.
Trigonometric identities & equations
Pythagorean, sum and difference, and double-angle identities, and solving trig equations.
Exponentials & logarithms
Log rules, solving exponential equations, and modeling growth and decay.
Polynomials & rational functions
End behavior, zeros, asymptotes, and sketching accurate graphs.
Vectors, polar & sequences
Vector operations, polar coordinates, and sequences and series.
Taught by a mathematics specialist
Northstar was founded by Joshua Lizardi, who holds an M.S. in Applied Mathematics, an M.S. in Data Analytics, a B.S. in Mathematics, and a Graduate Certificate in Applied Statistics, with 9+ years of teaching mathematics — including college and graduate-level instruction.
- Live one-to-one sessions through Zoom
- $50 per 60-minute session
- No contracts or required packages
- No charge for missed sessions
- Flexible scheduling
- Payment through Zelle
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Ready to walk into calculus prepared?
Tell us what course your student is taking and what they need help with.
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