exam Maths Puzzle Numerical Ability

Find the a(sub2) in the arithmetic sequence where a(sub5) = 42 and
a(sub10) = 62.

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exam Other Question

A collection of quarters and dimes is worth $6.75. The number of dimes is 4 less than three times the number of quarters. How many of each are there?

I am confused as to how I would write this out, and solve it.

Please help. If the area of a circle is 49pi, what is the circumference. I got 22cm