The angle in a semi circle is?​

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

Multiply. write your answer in simplest form. 3/8 x 5/7

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.