Your friend's job pays $10 per hour and he works 40 hours per week. his tax rate is 20 percent. assuming he works 50 weeks of the year, his yearly gross income is
a. $4,000
b. $16,000
c. $20,000
d. $40,000

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).

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.