Jane fills her empty car with 12 litres of petrol. After driving for the day the car now has 7.5 litres of petrol in the tank.

Calculate the percentage decrease of petrol in the car.

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.

Six random samples were taken each year for three years. the table shows the inferred population for each type of fish for each year.