exam Maths Puzzle Numerical Ability

x^2+(x+21)^2=(x+24)^2

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exam Other Question

which equation expresses th relationship between x and y for the following coordinates? (-2,4)(-1,2)(0,1)(1,1/2)(2,1/4)

a. y=-1*2^x
b. y=-1*1/2^x
c. y=2^x
d. y=1/2^x thirty percent of the sulfur desiccated. If 42 tons did not desiccate, how much sulfur was there in all?