How to write 3,000,000+600,000+80,000+10 in standard form

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

Which number can each term of the equation be multiplied by to eliminate the decimals before solving? 5.6j- 0.12=4+1.1j

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.