exam Maths Puzzle Numerical Ability

The difference when 7 less than a number is subtracted from twice the number is 12. What is the number

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exam Other Question

Can you verify my answers for the following questions? For #1 I got 6.3 m and for #2 I got 7.6 m. Are these correct?

1) A homeowner wishes to insulate her attic with fiberglas Find one set of polar coordinates for the point given in rectangular coordinates. The equation is {{{(2,-3)}}}.