book Maths Puzzle Numerical Ability

Im trying to find the measure of the fifth convex pentagon. the other measures are 100,130,152,and 90.
Aslo:
I m trying to find the mesaure of the largest angle in a triangle wi

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{{{bx^2+bx+a^2}}} where a and b are constants, and x is the unknown. The problem states: A computer is on sale for $1600, which is a 20% discount off the regular price, what is the regular price. I need to know the equation for types of problems l