"I still don't get it," Cassidy groaned, dropping her head onto the open textbook. "These formulas might as well be ancient hieroglyphs."
"You're overthinking it." I tapped the graph paper where she'd been working. "Just plug the numbers into the formula."
She lifted her head and fixed me with a death glare. "Easy for you to say. Your brain doesn't scramble the numbers."
"Fair enough."
We'd been at it for almost an hour. Her face had the pinched look it always got when math pushed her to her limit. Time for a break before she snapped that pencil in half—or stabbed me with it.
"Let's pause here. Ten minute breather."
Cassidy's eyebrows shot up. "Giving up on me already?"
"Not giving up. Regrouping." I stood and stretched. "Besides, I should check on Iris."
"Sure, run away to my baby sister." She leaned back in her chair, twirling her pencil between her fingers. "Just remember our bet. When I lose this test—which I absolutely will—you get me for twenty-four hours."
