Kia has 10 coins in a bag. There are three £1 coins and seven 50 pence coins.
Kia takes at random, 3 coins from the bag.
Work out the probability that she takes exactly £2.50

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

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William invested $5000 in an account that earns 3.8% interest, compounded annually. the formula for compound interest is a(t) = p(1 + i)t. how much did william have in the account after 6 years? (apex)