Urgent help for a fall exam! I currently need help on some questions (2, 3, 4). Thank you for the help!

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

Yvaries directly as x. y =90 when x=6. find y when x=13

Luis has a cooler filled with cans of soda.for every 5 cans of coke there are 3 cans of sprite.if there are 25 cans of coke, how mant cans of sprite are there?