Answer:
ok
Step-by-step explanation:
Answer:
4.2 x 10^10
Step-by-step explanation:
2.8 x 10^8 x 1.5 x 10^2 = 4.2 x 10^10
As its one significant figure you are looking at the first number and the second number. If the second number is greater than 5 then you round the first number up and vice versa. In this case there is an eight, which is bigger than 5 obviously so you round the first number to get 40000.
Answer:the ansewer is 80
Step-by-step explanation:
7*8-6+5=55
6*5+7+8=45
5*7+8+6=49
I will continue in the comments