exam Maths Puzzle Numerical Ability

solve:

a^N=a^1 + (n-1)d for d

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exam Other Question

hi! I am solving for base and rounding to the nearest hundreth as needed. I know that base= portion/rate however I can not figure these two problems out.

1. 36 is .75% of

2. 10,800 is 90% of

thanks! Add or subtract as indicated. Express your result in simplest form
3/ x^2 + 4x +3 - 1/ x^2 - 9