exam Maths Puzzle Numerical Ability

a plumber charged $110 for three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an eight-hour job?

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Hi could you help me simplify this expression?

sqrt8x^3 times sqrt2x^5

Thanks for the help step 1: The parabola opens up because a>0
step 2: find the vertex (2,1)
step 3: find x-intercepts:
0=(x-2)^2 + 1
(x-2)^2 = -1
x-2 = square root of -1
x=2+/-i
The equation ha