What is 0.00078 expressed in scientific notation

To form 780,000 we do:

Which means that for 0.00078 we'll do the same thing but flipping the powers sign:

Hope it helped,

BioTeacher101

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step-by-step explanation:

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads