## Wednesday, November 21, 2012

### Textbook: Chapter 2.4 Page 79 Question 16

16 a) The label on a 1-L can of paint states that the paint will cover an area of 10m². What is the length of the largest square area that the paint will cover? Express your answer to the nearest hundredth of a metre.

You just squareroot using a calculator

√10m²= 3.16227766
= 3.16m
Round of to the nearest hundredth of a metre.

b) what is the side length of the largest square area that a 3.79-L can of the same paint will cover? Express your answer to the nearest hundredth of a metre.

First off I rounded 3.79 to 3.80.

Then multiply 3.80 by 10

3.80x10 = 38
√38 = 6.164414003 round of to the nearest hundredth
= 6.16m

c) Nadia is applying two coats of paint to an area that is 4.6m by 4.6m. How much paint will she use if she applies the same amount of paint for each coat? Express your answer to the nearest tenth of a litre.

4.6x4.6= 21.16
21.16x2 = 42.32
42.32 ÷ 10 = 4.232 round to the nearest tenth of a litre
= 4.2L