exam Maths Puzzle Numerical Ability

Graph f(x)=10x-3
I did i went down three than up 10/1

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exam Other Question

A can do a piece of work in 25 days and B can do a work in 20 days.both work together for 5days after that a leaves. how long will B need to finish the remaining work. I am really having difficulty understanding this section of my algebra class.

Solve:

SQRT(3X+5)= SQRT(5X-7)

Can anyone show me the steps the solve this?