How do you work out the volume of a cube

If square root x = -7, then x= -49 true or false

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?

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.