exam Maths Puzzle Numerical Ability

simplify as best as possible.

(2+squareroot of 7)(9+squareroot of 7)

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exam Other Question

The length of a rectangle is 6 cm less than three times its width. If the area is 24 cm squared, find the length and width.

and

The length of a rectangle is 16 cm less than f
Solve by substitution or elimination:
x=3y+11
2x+5y=0
I dont understand could I please have help for this question?