2.Express the following numbers in usual form.
(i) $$3.02 × 10^{-6}$$

(ii) $$4.5 × 10^4$$

(iii) $$3 × 10^{-8}$$

(iv) $$1.0001 × 10^9$$

(v) $$5.8 × 10^{12}$$

(vi) $$3.61492 \times 10^6$$

(i)We have:$$3.02 × 10^{-6}$$

$$=\frac{302}{100}\times\frac{1}{10^6}=\frac{302}{100000000}$$

$$=302\times 10^{-8}=0.00000302$$

Thus, we have $$3.02 × 10^{-6}=0.00000302$$

(ii)We have:$$4.5 × 10^4$$

$$=\frac{45}{10}\times10^4=45\times 10^3$$

$$=45000$$

Thus, we have $$4.5 × 10^4=45000$$

(iii)We have:$$3 × 10^{-8}$$

$$=\frac{3}{10^8}=\frac{3}{100000000}$$

$$=0.00000003$$

Thus, we have $$3 × 10^{-8}=0.00000003$$

(iv)We have: $$1.0001 × 10^9$$

$$=\frac{10001}{10000}\times10^9=\frac{10001}{10^4}\times10^9$$

$$=10001\times 10^5=1000100000$$

Thus, we have$$1.0001 × 10^9=1000100000$$

(v)We have: $$5.8 × 10^{12}$$

$$=\frac{58}{10}\times10^{12}=58\times 10^{11}$$

$$=5800000000000$$

Thus, we have $$5.8 × 10^{12}=5800000000000$$

(vi)We have: $$3.61492 \times 10^6$$

$$=\frac{361492}{100000}\times10^6=\frac{361492}{10^5}\times10^6$$

$$=361492\times 10=3614920$$

Thus, we have $$3.61492 \times 10^6=3614920$$