57.3 kg rounded to the nearest tenth

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

Hey hotel charges guests $19.75 a day to rent five video games at this rate which expression can be used to determine the charge for renting nine video games for one day at this hotel? pls