book Maths Puzzle Numerical Ability

How do you figure out the size of an angle formed by a diameter of a circle and a secant. The Secant does not pass through the center of the circle. The size of the arc measures 80

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Midtown Delivery Service delivers packages for $10 per package. The driver is paid $2.50 for each package delivered and the cost to run the delivery truck is $120 per day. How ma what is the general equation of a parabola?

how do we graph these?

y=2(x+6)(squared)

-x(squared)+1