exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

I f(x) = 5x - 1, I need to find the following:
f(2r)

Thanks,
Sher

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exam Other Question

Mr.carlson drove a distance of 1000 miles to another city. He returned by plane. The eate of the plane was 10 times the rate at which he drove. He spent 22 hours on the trip. Find the rate at which he drove and the rate of the plane Hello,

I am having trouble with these problems:

1. Find the equation of the line that passes through the points A(2,-5) and B(-3,4). Express the result in four different for