exam Maths Puzzle Numerical Ability

Determine whether the lines are parallel, perpendicular, or neither.
y = 1/7x - 20
y = 7x + 15

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exam Other Question

1. 2 RADICAL 5 (3 RADICAL 2 + RADICAL 45 - 4 RADICAL 5 ) 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 +