I think the answer is $6.30 , because you have to add. So 2.80 multiple by 2 would be 5.6 and after that you divide 2.80 by 4 since .25 it's a quarter of the whole so that gives you 6.3.
Answer:
90%
can u plz make me brainliest?
Step-by-step explanation:

Let's assign some random values to it, and say 1 unit of petroleum costs 100 bitcoins, because we all know bitcoins are the best currency :P
If the price goes up by 10%, it is now 100*1.1 = 110bitcoins for 1 unit.
However he's only getting 0.9 units now, so multiplying 110 by 0.9 gives us 99 bitcoins. His petroleum bill used to be 100 (which is why I picked 100 as it's easier), and now it is 99. Therefore his petroleum bill has reduced by 1%
Answer:
the class has 12 girls and 16 boys what is the ratio of the total students to boys in simplest form
f(5) = 0.5^(5-1)*f(1) = 0.5^4 * 120 = 7.5