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Find an integer r such that r > 5 and 5r – 1 is a square number.
Find the value of s which makes 8s + 2 a prime number.
Write down an irrational number between 7 and 8.
Make a the subject of the formula y = (a-4)/(3-a).
Here are the first four terms of a sequence: 7, 11, 15, 19. Write down an expression, in terms of n, for the nth term…
u_n is the nth term of another sequence. Here is the formula connecting the nth and (n + 1)th terms of this sequence:…