What is 0.342 in scientific notation

move the decimal point to the right of the 3 ( count the number of places you moved it) that would be the exponent and since you moved it to the right it would be negative

3.42 x 10^-6

20

step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: