Points a and b lie on a circle centered at point o. if length of ab\radius=pie\10 what is the ratio of the area of sector aob to the area of the circle?

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Ariel is working at a meat packing plant for 5 nights a week. her regular wage is $11 an hour. she earns tine and a half for any overtime hours. this week she worked 9 hours of over time .how much will ariel earn for overtime this week ?

Which number line correctly shows 0.8 + 0.3?