A unit of gas costs 4.2 pence. On average Ria uses 50.1 units of gas a week.
She pays for the gas she uses in 13 weeks.
Work out an estimate for the amount Ria pays.

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.