Sunita is buying shower curtains and rails for her guest house. She needs more shower curtains than rails.
6 shower curtains and 3 rails would cost her £24.60. 5 shower curtains and 2 rails would cost her £18.60.
Calculate how much change Sunita would get from £40 when buying
7 shower curtains and 5 rails.
You must use an algebraic method

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Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?