How do i tell if a relation is a function?

What is 25/99 as a decimal

What is 10 more than 56

The formula p = 1.068a - 18.39 can be used to find the percent p of men at age a in years, with high blood pressure. What percent of 40 year-old men have high blood pressure?

The music you hear when listening to a magnetic cassette tape is the result of the magnetic tape passing over magnetic heads, which read the magnetic information on the tape.

Compare the period of y = 2x with the period of y = sin x

Sales at a certain department store follow the model y=85-13.254x where y is the total sales in thousands of dollars and x is the number of years after 2001. What was the first year that sales fell below $50,000?

You buy a car worth 40,000. The value depreciates at a rate of 10% each year. What will your car be worth in 5 years?

What is 2/3 times 6? 2/3 times 18? 2/5 times 15? 5/8 times 24?

Line L1 and line L2 are parallel. Which angle (s) are supplementary with A?

One gallon fills about 231 in3. An aquarium has a height of 15 in. and base measurements 9 in. by 18 in. About how many gallons of water does the aquarium hold?