exam Maths Puzzle Numerical Ability

Let A = (0,0), B = (4,2), C = (1,3), find the exact size of angle CAB. Justify your answer without your protractor.

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exam Other Question

I am having a very hard time remembering how to solve this type of system

1/40 + 1/(x+10) = 1/y

1/60 + 1/x = 1/y

Thank you,

Kristin running shoes in lots 50 or fewer pairs can be bought for 18 dollars per pair. the price decreases by 1.5 cents per pair for the excess over 50 pairs bought at one time up to 400 pairs. how many pairs can be bought for 4464 dollars.