7) Given triangle ABC alongside: a) Determine an expression for Angle A in terms of B and C. b) Hence, prove that cos A = sin B sin C - cos B cos C. В. C​

Asap! i'm not good math and i'm lost.

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x