book Maths Puzzle Numerical Ability

Multiply

10 4
7 x . 7x

isnnt is 14 with power of 40

14
x
49

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book Other Question

how many sides a convex polygan have if it has 35 distinct diagnals. Hi I am having a problem getting the answer to this problem. can someone please help?
The directions say to write in standard form and determine the values of a,b, and c.
3^2+10x