Please help i need the answer to this test question

What is the y intercept of f(x)=(1/2)^x?

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?