Language, notation and formulas
Language, notation and formulas

This free course is available to start right now. Review the full course description and key learning outcomes and create an account and enrol if you want a free statement of participation.

Free course

Language, notation and formulas

2.8.1 Try some yourself

Activity 9

What do the following mean?

  • (a) (5 + 8)/(4 − 2)

  • (b) 5 + 8/4 − 2

  • (c) (4 + 5)(5 − 2)

  • (d)

  • (e)

  • (f)

  • (g) (12 − 9)−1

Answer

  • (a) Add 5 and 8, and then divide the result by the difference between 4 and 2. (This gives .)

  • (b) Add 5 to the division 8/4, and then subtract 2. (This gives 5.)

  • (c) Multiply the sum of 4 and 5 by the difference between 5 and 2. (This gives 27.)

  • (d) Multiply 9 by the square root of 4. (This gives 18.)

  • (e) Multiply 5 by 6, and then divide by 2. (This gives 15.)

  • (f) The cube of the square root of 25. (That is, 125.)

  • (g) The reciprocal of 12 minus 9. (That is, )

Activity 10

What do these symbols mean?

  • (a) =

  • (b) <

  • (c) >

  • (d)

Answer

  • (a) = means ‘equals’ or ‘equal to’ or ‘which equals’.

  • (b) < means ‘less than’ or ‘which is less than’.

  • (c) > means ‘greater than’ or ‘which is greater than’.

  • (d) means ‘is approximately equal to’.

Activity 11

What do the following mean?

  • (a) mass ≥ 10 kg

  • (b) time < 2.4 × 106 h

  • (c) 2/3 ≠ 0.67

Answer

  • (a) The mass is greater than or equal to 10 kg.

  • (b) The time is less than 2.4 million hours.

  • (c) Two-thirds (or 2 divided by 3) is not equal to 0.67.

MU120_4M6

For further information, take a look at our frequently asked questions which may give you the support you need.

Have a question?
Free Courses

OpenLearn has over 800 free courses across all our subjects designed by our academic experts. From 1 to 100 hours, introductory to advanced, you can start learning at any time and all for free.