exam Maths Puzzle Numerical Ability

A cliff diver in Acapulco, Mexico, dives from about 17m above the water. The diver's height above the water h, in metres, after t seconds is modelled by
h= -4.9t squared + 1.5t +

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exam Other Question
Determine whether the lines are parallel, perpendicular, or neither.
y = 1/7x - 20
y = 7x + 15 Can you help me solve this problem?

(2/5w-10)-(3/2w-4)

I factored, found the LCD and arrived at the answer -11/10(w-2)
Is this correct?

Thanks for your help!