Prove that (1+sinA/1-sinA)=secA+tanA

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

Which data set has a greater spread? why? set a: {38, 12, 23, 48, 55, 16, 18} set b: {44, 13, 24, 12, 56} has a greater spread because .

Evaluate the expression. (9 + 5)(3 + 2)0