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

Jorge bought s 40 cent stamps and three times as many 25 cent stamps. How many dollars did he spend?

.40s +3s(.25)= x a canoeist can travel 10 mph in calm water. the amount of time it takes to travel 60 miles with the current is the same amount of time it takes to travel 40 miles against the current. find the rate of the current.