exam Maths Puzzle Numerical Ability

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

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exam Other Question

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? Can you help me with this problem?

Plot the points P(1, 5), Q(3, 5), and R(1, 7) on a coordinate plane.
(a) Where must point S be located so that the quadrilateral PQRS is a sq