Question

1. Calculate the value of 8. 1 × 103 − 2. 4 × 102 in standard form.

2. Blood comprises 8% of the weight of a human. Amy weighs 40kg. Find the weight of her blood.

Answer 1

Explanation:

1. We need to find the value of 8.1 × 10³ − 2.4 × 10² in standard form.

We can also write its as :

8.1 × 10³ − 2.4 × 10²

81000 − 240

Standard form = 80760

2.

Amy's weight = 40 kg

Blood comprises 8% of the weight of a human.

Weight of her blood,

`W=8\%\ of\ 40\\\\=(8)/(100)* 40\\\\=3.2\ kg`

So, the weight of her blood is equal to 3.2 kg.