7. If (2,- 1) is the solution to the following linear system, what are the values of a and b? ax +by = -7
2ax – 3by = 1

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line