Explain how you would estimate to subtract 189 from 643

Mathematics

1 answer:

Dima020 [189]3 years ago

5 0

I would just round up to 200 and then subtract twelve or just subtract 200 what ever way u prefer.

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108 identical books have a mass of 30 kg. Find

Lynna [10]

Answer:

(i) 540kg

(ii) 5.56 (rounded off to 3 significant figures)

Step-by-step explanation:

$108 \div 30 = 3.6kg$

$(i)3.6 \times 150 = 540kg$

$(ii)3.6 \times x = 20$

$3.6x = 20$

$x = \frac{20}{3.6}$

$x = 5 \frac{5}{9}$

4 0

3 years ago

Can anyone help me please??:((

Rufina [12.5K]

<h2>The Third table of ordered pairs represents a proportional relationship. </h2>

Explanation:

A proportional relationship is defined as the relationship between two quantities where one is directly proportional to another with a proportionality constant.

For example, y = ax

Here a is the proportionality constant.

This expression shows that y varies directly as x varies.

From the tables mentioned in the below attachment, we can easily say that "Table 3" has the ordered pairs which represents proportional relationship.

Table 3 defines y is directly proportional to x with proportionality constant $\frac{1}{7}$ .