How do you create a restriction for √z + 8=13 ?

2.5 milligrams is equivalent to how many grams

At the county fair, the baxter family bought 6 hot dogs and 4 juice drinks for $12.90. the farley family bought 3 hot dogs and 4 juice drinks for $8.55. find the price of a hot dog and the price of a juice drink.

How do you write 0.5% as a fraction