Chrissy is 7 years younger than her brother, Larry. If larry is L years old, write the expression for chrissy's age need help asap

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

If the discriminant if a quadratic equation is 4 which statement describes the roots?

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?