# 4.2 x 10^3 / (2.1 x 10^-2) x (3 x 10^-2) x (3 x 10^0)?

Question:Write in scientific notation and compute, keeping the answer in scientific notation. Help me solve it. Answer: 1.8 x 10^4

Put all your decimals numbers together:

4.2/2.1 (3)(3) = 2x3x3 = 18

Now for your powers of 10 apply the rules of exponents:
(x^a)(x^b) = x^(a+b) {add exponents when multiplying}
(x^a)/(x^b) = x^(a-b) { subtract for division}

So its 10^(3--2+-2+0) = 10^3

Now we have 18x10^3, which equals 1.8 x 10^4

ta da!
solve it step by step
note 10 ^ 0 = 1
10 ^ -2s cancel out

4200x 3x 3 /2.1 = 18000
Some say 4.2 others say 18 000

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