exam Maths Puzzle Numerical Ability

I need help simplifying
the squae root of 28x^2y + the square root of 63x^2y^3. Thank you very much.

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PLease help me to solve the following :

Draw and label a figure for the situation described below.

On line L, ray AB and ray CD have no points in common.

thank you! Cesium 13 is a radioactive element with a half life of 30 years. Predict how much of a 60mg sample of cesium137 would remain after 210 years. I am trying to figure out the formula to solve this Thanks