3. Sarah took five tests, each with full marks of 100 . If her marks in three tests are \( 94,88,81 \), what is the least mark she could get in one of the other two tests to achieve an average of 83 marks in the five tests?

c) \( 8+(-18): 3= \)

\( 37 ; 33 ; 29 ; x ; 21 ; \ldots \). Write down the value of \( x \). Determine the \( n^{\text {th }} \) term of the number pattern. Determine the \( 15^{\text {th }} \) term of the sequence. Which term is the first to have a negative value.

10. A girl swims 400 m in still water and then returns to the initial point (from where she started) in 20 minutes. Determine the speed of the girl. 11. A man is running at a speed of \( 3 \mathrm{~m} / \mathrm{s} \) and covers some distance in 15 sec . Find the time taken by his pet dog to cover the same distance at a speed of \( 10 \mathrm{~m} / \mathrm{s} \).

Find \( \frac{5}{6}-\left(-\frac{3}{4}\right) \). Write your answer as a mixed number in simplest form.

Find \( -\frac{7}{8}-2 \frac{1}{6} \). Write your answer as a mixed number in simplest form