exam Maths Puzzle Numerical Ability

Can someone do this for me?

simplify. radical80 - radical5

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exam Other Question

i need help with the problem(-2c + d)(c + 2d) multiplying polynomals by binomials Divide. ROund to the nearest thousandth.

4.00 divided by 13
4.00 is outside the division sign and 13 is on the inside...show your complete work