9/10 of a sum of money is £45. find the whole amount.

What is the volume of the sphere shown below with a radius of 3?

Solve the system of equations. y= 2x y= x^2 - 15

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 33 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30 ∘c on monday, but decreased at a constant rate in the next 33 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.