What is the greatest common factor of 40 80 100

Find an equation for the linear function which has slope -10 and x-intercept -7

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

You and a friend went to the movies.you spent half your money on tickets. then you spent 1/4 of the money on popcorn, $2 on candy, and $3 on a soda. if you have $1 left, hiw much money did u take to the movies?