3. Shawna and Owen went out to dinner. Their total bill wo \( \$ 86 \). If they added a \( 22 \% \) tip and split the bill evenly, hov much did each person pay for the meal?

What is the absolute value of \( -12 + 4 \)?

\( \vdots 05 \) Barbara effettua una spesa di 8 euro e 50 centesimi e paga con una banconota da 20 euro. Il negoziante ha esaurito le banconote da 10 euro e da 5 euro e dà il resto in monete da 2 euro e da 50 centesimi. In tutto dà come resto 11 monete. Quante monete da 2 euro e quante da 50 centesimi sono state date dal negoziante come resto?

19. The sides of a triangle are in the ratio of \( 2: 3: 4 \). If the perimeter is 72 cm , find its sides. 20. In a factory the ratio of number of defective bolts produced to the number of good bulbs is \( 1: 10 \). In one hour the factory produced 330 bolts. Find the number of defective bulbs produced by the factory in an hour. 21. The present age of father is 45 years and her daughter is 20 years. Find the ratio of (a) present age of father to present age of daughter. (b) age of farther to the age of daughter when daughter was 15 year old. (c) age of daughter to father when father was (c) vears old.

If \( 3^2 \) is calculated, what is the result?

\( \frac{3}{\frac{3}{4}} \) of \( \frac{4}{9} \div 9 \frac{1}{2} \)