Evaluate the expression given cos a=4/5 for 0<a<pi/2 and sin b=-15/17 for 3pi/2<b<2pi. SHOW WORK 1.sin(a+b)
answer must equal -36/85

2.cos(a-b)
answer must equal -13/85

3.tan(a+b)
answer must equal -36/77

4.tan(a-b)
answer must equal -84/13

Explain how you can use the triangle sum theorem to find the measures of the angles in an equilateral triangle. the angles of an equilateral triangle are . let the measure of each angle be x. then, by the triangle sum theorem, x + x + x = 3x = ° solving for x gives x = °

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Question b of 10which of the following describe an angle with a vertex at a? check all that applyo a. labcов. савd dooo c_baco d. zacb