Answer: 3:8
Explanation: To get this you have to divide each number by the two numbers' GCF (Greatest Common Factor) and in this case the GCF is 10, so you divide both numbers by 10 and get 3 and 8.
3.5r.....................
The answer is A because B doesn't make sense
recall that 1 - sin²(θ) = cos²(θ).