Answer:
(a) By using only one number operation, we can form the following expressions \[t+4,t-4,4t,\frac{t}{4},\frac{4}{t},4-t,4+t,\]etc. (b) By using only two number operations, we can form following expressions by using \[y,\,\,2\] and 7 \[2y+7,2y-7,7y+2,7y-2,\] \[\frac{y}{2}+7,\frac{y}{2}-7,\frac{y}{7}+2,\frac{y}{7}-2,\] All these expressions are different.
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