Pls help me I’ll give u 50 points and brainlest if it’s right

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

What is the probably of getting heads when poing a coin and getting a number greater than or equal to 5 when rolling a single diea) 1/6b) 1/3c) 1/4d) 1/12

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)