A bacteria culture doubles in size every 20 minutes. How long will it take for a culture of 40 bacteria to grow to a population of 1280?

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250