£3.23 + £1.47 = What is the answer i've tried so many different ones an they never seem to be wright?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together.rock a was 0.5 of the total weight.how much did rock a weigh?

Is the power produced directly proportional to the wind speed, give reasons for your answer?

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?