exam Maths Puzzle Numerical Ability

1/250=1/2,000,000+1/1

The image distance of i for an object that is 2,000,000 mm from a 250-mm telephoto lens.

Using the formula 1/f=1/0+1/t

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exam Other Question

I need help to perform the given operation

f(x)=2x2-13x+15, g(x)=3x+4

I need to find (f+g)(-1)
add. 5b^3 - 8b + 2b^2 and 3b^2 - 7b^3 + 5b.

I need help with this. Thanks