The diagram shows a 9cm x 7cm rectangle based pyramid all the diagonal sides- TA TB TD are length 12cm work out angle TAC to one decimal place

Find the domain of the following expression: 1/(√x)-2

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Ashop has a sale that offers 20% off all prices. on the final day they reduce all the sale prices by 25% linz buys a ratio on the day. work out the overall percentage reduction on the price of the ratio