exam Maths Puzzle Numerical Ability

Multiply and simplify by factoring.

√45 * √40 = ________

Those are supposed to be radicals, I hope I'm using the right symbol.

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exam Other Question

Find each of the following squares.

(w-1/4)^2
How do I do a linear equation of

a+d=100
1.00a+1.50=120

can you give me the steps to do so.