Perform the following operations :
`3.97 xx 10^7 + 1.98 xx 10^4`

Perform the following operations : 3.971 xx 10^7+ 1.98 xx 10^4

Perform the following operations : 4.11 xx 10^-3 + 8.1 xx 10^-4

Perform the following operations : 2.112 xx 10^6 - 3.5 xx 10^5

Perform the following operations : 1.05 xx 10^-4 -9.7 xx 10^-5

Perform the following operations : 4.11 xx 10^(-3)+ 8.1 xx 10^(-4),

Write each of the following in exponential notation : 0.011 xx 10^-3 .

Write each of the following in ordinary decimal form : 3.75 xx 10^-1

Perform each of the following calculations . Round off your answers to two digits. frac (1) ((3.40 xx 10^(24))

Express the following sum to appropriate number of significant figures : 2.3 xx 10^3 mL + 4.22 xx 10^4 mL + 9.04 xx 10^3 mL + 8.71 xx 10^5 mL

Perform each of the following calculations . Round off your answers to two digits. frac (33) (9.00 xx 10^(-4))