Angle a and angle b are complementary angles of right triangle abc, cos a = 0.83, and cos b = 0.55. what is sin a + sin b?
a) 0.28
b) 1
c) 0.38
d) 1.38

Write the fraction or mixed number and the decimal shown by the model

Find the area of an equilateral triangle with a side of 6 inches

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?