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Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
---|---|---|---|---|---|---|

8.1 | Writing Formulas and Substituting in a Formula |

**Correct Answer: A**

* 1. .*A certain product costs $37 per item plus $2 shipping cost. What is the formula that gives the total cost C for ordering N items from this product?

- C = 37 (2 + N)
- C = 37N + 2
- C = N(37 + 2)
- C = 37 + 2N

**Correct Answer: C**

* 2. .*What is the variable y in the formula

y = *a - b/1 - c**/*

if a = 8, b = 5 and c = 4?

- -1
- 1
- 2
*1/7**/*

**Correct Answer: A**

* 3. .*What is the formula applied in the spreadsheet shown below?

- y = x + 8
- y = 2(x + 3)
- y = 2x + 3
- y = 3x - 2

**Correct Answer: C**

* 4. .*A car is moving at v

- 24 m
- 40 m
- 64 m
- 84 m

**Correct Answer: C**

* 5. .*What is the inverse formula of

y = 4 - 2x

- y = 2 - 4x
- x = 2 - 4y
- x = 4 - 2y
- x = 2 - y/2

**Correct Answer: D**

* 6. .*What is the maximum value of y in the formula

y = 9 - x^{2}

- -3
- 0
- 9
- 27

**Correct Answer: C**

* 7. .*The number N of bacteria per square millimetre in a sample decreases when using a new antibiotic according the formula

N(t) = N_{0} ∙ 2^{-0.6t}

where N_{0} is the initial number of bacteria in the sample and t is the time in hours.

Calculate the number of bacteria per square millimetre left in the sample 5 hours after starting the cure if the original number of bacteria was 6,432.

- 6,424
- 804
- 604
- 101

**Correct Answer: B**

* 8. .*What is the value of z in the formula

y = 3x^{2} *-z/2+5**/*

if x = 2 and y = 10.

- 5
- 7
- 10
- 14

**Correct Answer: D**

* 9. .*What is the value of x in the formula

y = 5 - x^{3}

if y = -3?

- -22
- 2
- 32
- -2

**Correct Answer: B**

* 10. .*The products A, B and C in a market had a discount of 10%, 20% and 30% respectively. What is the formula that gives the new cost Y when purchasing one item from each product?

- Y = 90A + 80B + 75C
- Y = (0.1 + 0.2 + 0.25)(A + B + C)
- Y = 0.1A + 0.2B + 0.25C
- Y = 0.9A + 0.8B + 0.75C

**Correct Answer: D**

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