The students heated 100 g of soil in an oven at 105°C for 24 hours. The mass at the end of the experiment was 70 g. Determine the percentage (%) amount of water in the soil sample. Show your working.

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Which is f(5) for the function –2x2 + 2x - 3?

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?