8 (a) Work out an estimate for the value of $ abla ext{√}63.5 imes 101.7$ (2.3)³ = 148 correct to 3 significant figures - Edexcel - GCSE Maths - Question 8 - 2019 - Paper 1

To find $(2.3)³$, calculate:

$(2.3) imes (2.3) imes (2.3) = 12.167$

Rounding this result to 3 significant figures gives us:

$12.2$

So, $(2.3)³ = 12.2$.

To evaluate $(0.23)³$, we compute:

$(0.23) imes (0.23) imes (0.23) = 0.012167$

Rounding to 3 significant figures, we get:

$0.0122$

Thus, $(0.23)³ = 0.0122$.

The value of $5²$ is calculated as:

$5 imes 5 = 25$

So, $5² = 25$.