The time, T (seconds), it takes for a pot of water to boil is proportional to the amount, A (litres), of water. It takes 190 seconds to boil 2.1 litres of water. Work out how long it takes (to the nearest second) to boil 2.5 litres.

4. find the geometric mean of 4 and 12. 24 8

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

If you measured the width of a window in inches and then in feet with measurement would you have the greater number of units