1. Brianne and Rana are planning a trip to the United States. As part of their research, they have found out some midday temperatures at places they plan to visit: Disneyworld, Los Angeles 86 ˚F Devil’s Tower, Wyoming 41 ˚F Death Valley, (hottest place in the USA) 113 ˚F Who has been to Disneyworld in L.A.?

2. Disneyworld 86 ˚F

3. Death Valley, (hottest place in the USA) 113 ˚F

4. Devil’s Tower, Wyoming 41 ˚F

5. C = 5F -160 9 1. What do the letters C and F mean in this formula? 2. Explain what the term 5F means in this formula? 3.Most formulas in algebra do not use the × symbol or the ÷ symbol. Explain how this formula shows division? 4. Convert the three temperatures into degrees Celsius. Disneyworld, Los Angeles 86 ˚F Devil’s Tower, Wyoming 41 ˚F Death Valley, (hottest place in the USA) 113 ˚F 5. Explain in words what this formula does. 6. Why do you think we use algebra rather than words to explain how to convert from ˚F to ˚C? All of these temperatures are measured in degrees fahrenheit. Brianne and Rana want to change them into degrees Celsius, which is what we use in NZ.

6. Multiplication & Division in Algebra The symbols × and ÷ are not used often in algebra. Leave out the multiplication sign. E.g. 5 lots of x, or 5 × x, is written as 5x. Instead of writing a division sign, use the fraction symbol. E.g. x divided by 8, or x ÷ 8, is written as. Copy down these expressions & write them as simply as possible. 1.4 × y 2. x ÷ 2 3. y × x × 9 4. 6 ÷ x 5. 4x ÷ 3y 6. y × 3x 7. 6y × x 8. 2x ÷ y

7. Addition & Subtraction 1. x decreased by 15 2. 8 less than y 3. 24 more than x x – 15 y – 8 x + 24