exam Maths Puzzle Numerical Ability

Find the LCM of 15z^8 and 45z^7
Please help me solve this equation

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exam Other Question

Could someone help me solve the substitution method using this example.

2x + 7y =12
x=8 -4y

What is the soltuion A circle is inscribed in a square and a regular hexagon is inscribed in that circle. The area of the square is 36 square cm. Find the following:
A) The perimeter of the square