exam Maths Puzzle Numerical Ability

Find the center and vertices for the hyperbola given by the equation x^2/7-y^2/25=1

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exam Other Question

CONVERT THE RATE INTO THE GIVES UNITS

1) 20 mi/h to feet per second

2)1 gal/h to ounces per second

3)50 km/h to miles per hour Please someone help...I've been trying to figure where I'm going wrong....I get almost to the end and my last fraction is always wrong...so I'm not multiping somewhere right....