book Maths Puzzle Numerical Ability

Please help solve into a graphable solution
y(a)=1000x(0.97)^x

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book Other Question

when subtracting two negative numbers do u add or subtract ex. -24-(-54) Please help me!!!! I need to solve this for H:
2A-ha=hb

A)h=a-b/2A
B)h=2A/a-b
C)h=a+b/2A
D)h=2A/a+b

Please show me step by step how to figure this out...thanks