Answer:When two lines intersect they form two pairs of opposite angles, A + C and B + D. Another word for opposite angles are vertical angles. Vertical angles are always congruent, which means that they are equal. Adjacent angles are angles that come out of the same vertex.
1) Initial temperature for t=0 T(0)=68+144e^(0)=68+144=212°F 2) After 15 min T(15)=68+144e^(-0.04*15)=68+144e^(-0.6)=147°F 3) 125°F -> t=? 125=68+144e^(-0.04t) 144e^(-0.04t)=125-68=57 e^(-0.04t)=57/144=0.4 you can apply ln on both sides: -0.04t=ln(0.4) solving you get t=23.3 min
