exam Maths Puzzle Numerical Ability

each pair of points lie in a line with a given slope. find x.
(4,3), (x,7) slope=2
how would you complete this??

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exam Other Question

You have $25,000 to invest. Part at a 14% interest rate and part at at 18% interest rate. What is the most you can invest at a 14%interest rate to yield at least $3600 return. solve the equation:

sq rt of 3x+1 +2 =4

i am so conufesed please help
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