exam Maths Puzzle Numerical Ability

A survey crew took a trip up the river and back in 10 h. Going upstream they paddled at 4 km/h, but downstream they travelled at 12 km/h. How far upstream did the crew go?

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exam Other Question

Which of the following conics is represented by the equation
6x^2-5y^2+4x-3y+2=-1

a.ellipse (not a circle)
B.hyperbola
c.circle
d.not conic
e.some other conic
f.parabola I made a mistake on the last one I turned in. It was number 10 on page 196 not 18.

But now this is number 18:

Page 196 Number 18

four less than seven times a number