There are 495 coins in a bottle 1/3 of the coins are £1
124 of the coins are 50p
the rest of the coins are 20p
work out the total value of the 495 coins

PLEASE HELP ME
Explanation as well please :)

After applying the composition r0.90 ry to rs what are the coordinates of r' and s'? a.r'(–3, 1),  s'(–3, 5)b.r'(–1, 3),  s'(–5, 3)c.r'(1, 3),  s'(5, 3)d.r'(5, 3),  s'(1, 3)

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is . reset next