Question

a) Work out (5 x 10^3) x (9 x 10^7)
Give your answer in standard form.

Answer 1

thats ittttttttttttttttttttt

Answer 2

do the regular numbers first:

5x9=45

then, do the scientific notation: basically, add the exponents and keep the 10:

10^3 x 10^7 = 10^10

your answer is (45 x 10^10). in scientific notation, it's (4.5 x 10^11). in standard form, it would be 450000000000.