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Thickness of layer 2. The thickness is assumed to be constant.

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Thickness of layer 1. The thickness is assumed to be constant.

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One layer is {a} m thick. The other layer is {b} m thick.

\n

i.e. $\\simplify[basic]{ {a} + {b} }$

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Add the two numbers together. The answer must have 2 digits. If the final digit before rounding is 5, round up.

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The thicknesses of two sedimentary layers are given. The student has to add the thicknesses and give the answer to 2 siginificant figures.

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The thickness of two sedimentary layers is measured. Caclulate the total thickness. Give your answer to 2 s.f.

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