exam Maths Puzzle Numerical Ability

How do you get the angles of a triangle when you are given the lengths of the sides?

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exam Other Question

A coupon book for a brisge costs $21 per month. The toll for the brisge is normally $2.50, but it is reduced to $1 for people who have purchased the coupon book.

a.)Let x repre Please help me find the formula to this sequence with a variable difference.
-1, -1, 0, 2, 5, 9, nth term.

I know the difference increases by one (+1)for each succeding term,