Write the decimal equivalent of the following: seven hundred seventy-five thousandths?

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.