Answer:
cscθ = 5/4
Explanation:
cscθ = hypotenuse ÷ opposite
we need to work out what is the length of b to to find the opposite
b^2 = 15^2 - 9^2 = 144
b = 12
now we have the opposite side = 12
back to equation cscθ = hypotenuse ÷ opposite
where they hypotenuse = 15, opposite = 12
cscθ = 15 ÷ 12 which is simplified to 5/4