A clothes shop has some special offers. T-shirts are buy one get one free and jumpers are 3 for 2.
The normal price of a T-shirt is £5.20 and the normal price of a jumper is £10.50.
How much does it cost to get 6 jumpers and 6 T-shirts using this offer as appropriate?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.