exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (9,9) and (-9,-1)
a. -9/5
b. 9/5
c. -5/9
d. 5/9

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exam Other Question

Determine the domain of f in f(x)=10- the square root of 3-x Solve:
a) 2 logbase6 x - logbase6 4 + logbase6(x-1)
b) 3^(2x+1)-28(3)^x +9=0
d) log(x-2)+log(x+1)=1