Answers

Пришли, пожалуйста, фото страницы ещё раз или перепиши условия заданий 5–9 — их текста сейчас не видно.

This is a continuation of tasks 5–9. Quick answers:

5.
\[ 2x+8+(x+3)=\boxed{3x+11\text{ km}} \]

6.
a) Liam: \(\boxed{x+15}\) marks
b) Percy: \(\boxed{x+y+15}\) marks
c) Total:
\[ x+(x+15)+(x+y+15)=\boxed{3x+y+30}\text{ marks} \]

7.
\[ \boxed{5r+7y\text{ dollars}} \]

8.
\[ 3p+4p+6p+3p+5p=\boxed{21p} \]

9. The lower part of the diagram is covered/cut off, so its dimensions cannot be read. Send a close-up of №9.

1

a. Bubbles form all through the liquid and rise.

b. The liquid slowly disappears from the surface. There are no bubbles.

c. Boiling is faster because the whole liquid changes to gas. Evaporation happens only at the surface.

2

Boiling:

      steam ↑
   ○  ○  ○  ← bubbles
 ┌─────────┐
 │ • • • • │ ← liquid particles
 └─────────┘
     heat ↑

Evaporation:

       • ↑  ← particle escapes
 ┌─────────┐
 │ • • • • │ ← particles
 └─────────┘
   surface only

1a. Bubbles form throughout the liquid.
1b. The liquid changes to gas at the surface.
1c. Boiling is faster because the whole liquid changes.

2.

• Boiling: bubbles form.
• Evaporation: only surface particles escape.